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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 157, ,
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CHAPTER, 6,
Reflection and Refraction, 6.1 Light, Light is that form of energy which produces the, sensation of sight. Light energy travels through, vacuum well as different transparent media in, the form of electromagnetic waves. In vacuum as, well as in air, light travels with a constant speed, of 3 # 108 ms-1 ., Light travels from one point to other, along a straight path. This is called rectilinear, propagation of light. A bundle of rays constitutes, a light beam., , 6.2 Reflection of Light, It is the phenomenon of bouncing back of light, to the same medium after striking a surface., A glass sheet having a uniform thin coating of, silver on one side acts as a reflector and is called, a mirror., 6.2.1 Laws of Reflection, Two important laws of reflection are as follows:, 1. The incident ray, the reflected ray and the, normal to the reflecting surface at the point, of incidence, all lie in the same plane., 2. The angle of incidence and angle of reflection, are equal and they lie on opposite sides of, normal., , 6.3 Image, When rays of light starting from a point object,, after reflection from a mirror, actually meet or, appear to meet at a point, then this second point, is called the image of that object point., , If light rays from an object, after reflection or, refraction, actually meet at a point, then the, image is called a real image. A real image is, always inverted and can be obtained on a screen., If light rays from an object, after reflection, or refraction, do not meet but appear to meet at, a point, then the image is called a virtual image., A virtual image is always erect and cannot be, obtained on a screen., Image of an object formed by a plane mirror, is virtual and erect, same size as the object, as, much behind the mirror as the object is placed, in front of it and is laterally inverted., , 6.4 Spherical mirror, It is a mirror whose reflecting surface is a part, of a hollow sphere of the glass. A spherical, mirror whose reflecting surface is curved inwards, is called a concave mirror. A spherical mirror, whose reflecting surface is curved outwards is, called a concave mirror., A spherical mirror whose reflecting surface, is curved outwards is called a convex mirror., 1. In a spherical mirror, the centre point of the, reflecting surface is ‘pole’ (P)., 2. The centre of curvature (C ) of a spherical, mirror is the centre of hollow glass sphere, of, which the given mirror is a part. The radius, of curvature (R = PC ) of the given mirror is, defined as the radius of the sphere, of which, the reflecting surface of the mirror forms a, part., , 6.3.1 Real and Virtual Images, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 158, , Reflection and Refraction, , 3. Principal axis is the line passing through pole, P and centre of curvature C of a mirror. The, diameter of reflecting surface of a spherical, mirror is called its aperture., 4. The principal focus (F ) of a spherical mirror, is a point on its principal axis where light, rays travelling parallel to the principal axis, of the mirror, after reflection, actually meet, (in concave mirror) or appear to meet (in, convex mirror). Principal focus of a concave, mirror is a real point situated in front of the, mirror and of a convex mirror is a virtual, point situated behind it., 5. The distance between pole P and principal, focus F of a spherical mirror is focal length, (f ), i.e., PF = f . For a spherical mirror,, f =R, 2, R = 2f, , Chap 6, , 6. Focal plane is a plane passing through, principal focus and normal to the principal, axis of a mirror., 7. The position, nature and relative size of, image formed by a concave mirror depend, upon the position of the object situated in, front of the mirror as shown in the following, table., Formation of image by a concave mirror for, different positions of the object, Position, of the, object, 1. At, infinity, , 2. Beyond, , C, , Position, of the, image, , Relative, size of the, image, , Nature of, the image, , At the, focus, , Highly, diminished, (pointsized), , Real and, inverted, , Between, F and, , Diminished, , Real and, inverted, , (F ), , C, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 159, Position, of the, object, , 3. At C, , 4. Between, C and, , F, , 5. At, , F, , 6. Between, P and, , F, , Position, of the, image, , Relative, size of the, image, , Nature of, the image, , At C, , Same size, as the, object, , Real and, inverted, , Beyond, , Enlarged, , Real and, inverted, , At, infinity, , Highly, enlarged, , Real and, inverted, , Behind, the, mirror, , Enlarged, , Virtual, and erect, , C, , sharp turns and as shop security mirrors in, large shopping halls and malls., , 6.5 Sign convention, According to new Cartesian sign convention, for mirrors, all distances are measured, from the pole of the mirror and object is, always situated to the left of the mirror., Pole is considered as origin for measuring, distances along principal axis. All distances, measured to the right of origin along the, principal axis are taken positive and to the, left of origin are taken negative., , 8. A convex mirror forms a virtual, erect and, diminished image of an object situated in, front of it as shown in the following table., Formation of image by a convex mirror for, different positions of the object, Position, of the, object, , Position of Relative, the image size of the, image, , Nature, of the, image, , 1. An, infinity, , Behind, the mirror, at the, focus F, , Highly, diminished, (pointsized), , Virtual, and, erect, , 2. Between, infinity, and pole, P of the, mirror, , Behind, the mirror, between, P and F, , Diminished Virtual, and, erect, , 9. Concave mirrors are used as shaving and, make-up mirrors to see a large-sized erect, image of the face. They are used as reflectors, in torches, searchlights and headlights of, vehicles to get powerful parallel beam of light., They are used by dentists to see large images, of a patient’s teeth. Eye and ENT specialists, also use these mirrors to focus light coming, from a lamp onto the eye, ear, nose, throat,, etc., of a patient in order to examine better., They are used to concentrate the sun’s, radiation to a point in a solar furnace., 10. Convex mirrors are used as driver’s mirrors, in vehicles in order to have a wider field of, view for traffic coming from behind. They, are also used as reflectors in hilly areas at, , Along a direction perpendicular to principal, axis, distances measured above the principal, axis are taken positive but below the principle, axis are taken negative., , 6.6 Mirror formula, If object distance = u , image distance = v, and focal length = f , then according to mirror, formula, we have, 1 + 1 = 1 or 2 , where R = Radius of, v u, R, f, curvature of the mirror, On putting numerical values of u, v f or, R, proper sign must be used according to sign, convention., , 6.7 Linear magnification, The ratio of height of the image (hl) to the, height of the object (h) is linear magnification, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 160, , Reflection and Refraction, , of an object, i.e.,, m = hl = v, u, h, Linear magnification is negative for real, image but positive for virtual image. If image is, magnified, m > 1 and if diminished, m < 1., For plane mirror, m =+ 1., , 6.8 Refraction of light, It is the phenomenon of the change in direction/, bending of a ray of light incident obliquely at, the interface of two different transparent media., 1. When light travels from optically denser, medium to rarer medium, it bends away, from normal., 2. When light travels from optically rarer, medium to denser medium, it bends towards, the normal., 6.8.1 Laws of Refraction, Two important laws of refraction are as follows:, 1. The incident ray, the refracted ray and the, normal to the interface of two media at the, point of incidence, all lie in the same plane., 2. The ratio of sine of angle of incidence (sin i), to the sine of angle of refraction(sin r) is, a constant for light of a given colour or, wavelength and for a given pair of media., This law is called Snell’s law of refraction., As per the law,, sin i = a constant, sin r, , = (n21) (Refractive index of med., 2 w.r.t. med. 1), , 6.9 Refractive index of a medium, The ratio of speed of light in vacuum (or air), to speed of light in the given medium is called, refractive index of a medium., Refractive index,, Speed of light in vacuum (air), n =, Speed of light in the given medium, = c, v, , Chap 6, , It is a unit-less quantity and its numerical, value is 1 or greater than 1. For vacuum and air,, n = 1., 1. If a light ray is refracted from medium 1 to, medium 2, then refractive index of medium 2, w.r.t. medium 1 (n21) is defined as the ratio, of speed of light in medium 1 (v1) to speed of, light in medium 2 (v2)., So, refractive index of medium 2 w.r.t., medium 1,, n21 = v1, v2, or, n21 = v1 = n2, v2, n1, Therefore, n12 = 1, n21, 2. Relative refractive index of one medium w.r.t., another medium too is a unit-less quantity, and its numerical value may be equal to 1 or, greater than 1 or even less than 1., 3. The refractive index of vacuum is called, absolute refractive index., 4. If a ray of light is refracted through a, rectangular glass slab, the angle of emergence, is same as angle of incidence. Hence, emergent, ray travels in a direction parallel to that of, incident ray., But, the ray suffers a lateral displacement, whose value is based on (i) thickness of the, glass slab, (ii) refractive index of the glass, slab, and (iii) angle of incidence. For angle of, incidence (+i) = 0c, the lateral displacement, is also zero (0)., 5. Due to refraction of light, a pencil immersed, in water in a glass tumbler appears to be, displaced at water-air interface. When a, glass slab is placed over some printed matter,, words appear raised up when observed or, seen through the glass slab., 6. If a coin is placed at the bottom of a tumbler, filled with water, the apparent depth of the, coin appears to be less than its true depth, because of refraction of light., Therefore,, Real depth (h), = Refractive index, Apparent depth (hl), , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 161, , of water (nw), For similar reason, a pond of water appears, to be shallower., , a lens, parallel beam of light may be incident, on any of its two surfaces having two principal, foci F1 and F2 , placed symmetrically on two, sides of a lens., , 6.10 Lens, Is is a part of refracting material, i.e., glass,, bound by two non-parallel surfaces, of which, either both or one surface is spherical., A lens thicker at the middle and thinner at, the edges is known as a convex (converging) lens., A lens thicker at the edges and thinner at, the middle is known as a concave (diverging), lens., 1. A lens contains two centres of curvature and, two radii of curvature as shown in the figure., , 2. Principal axis is a line passing through two, centres of curvature of a lens., 3. The optical centre of a lens is the point on its, principal axis, a ray of light passing through, which goes undeviated. It is the centre of the, lens., 4. A point where a light beam travelling, parallel to the principal axis of the lens, after, refraction, actually meets in convex lens or, appears to be diverged from in concave lens, is called principal focus (F ) of the lens. As, in, , 5. Focal length (f ) is the distance of principal, focus from optical centre of a lens., 6. Focal plane is a plane passing through, principal focus and perpendicular to the, principal axis of a lens., The position, nature and size of the image, formed by a convex lens are based upon the, position of the object placed in front of the, lens as mentioned in the following table., Formation of image by a convex lens for, different positions of the object, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 162, , Reflection and Refraction, Position, of the, object, , Position, of the, image, , Relative, size of the, image, , Nature of, the image, , 1. At, infinity, , At focus, , Highly, diminished, (pointsized), , Real and, inverted, , 2. Beyond, , Between, F2 and, , Diminished, , Real and, inverted, , Same size, as the, object, , Real and, inverted, , 2F1, , 3. At, , 2F1, , F2, , 2F2, , At, , 2F2, , 4. Between, F1 and, , Beyond, , Enlarged, , Real and, inverted, , 5. At focus, , At, infinity, , Infinitely, large, (highly, enlarged), , Real and, inverted, , 6. Between, focus, F1 and, optical, centre O, , On the, same, side of, the lens, as the, object, , Enlarged, , Virtual, and erect, , 2F1, , F1, , 2F2, , 7. A concave lens always forms a virtual, erect, and diminished image of the object on the, same side of the lens as mentioned in the, following table:, Formation of image by a concave lens for, different positions of the object, Position, of the, object, , Position of Relative, the image size of the, image, , Nature, of the, image, , 1. An, infinity, , At focus, , Highly, diminished, (pointsized), , 2. Between, infinity, and, optical, O of the, lens, , Behind, focus, F1 and, optical, centre O, , Diminished Virtual, and, erect, , F1, , Virtual, and, erect, , Chap 6, , The sign convention for lenses is same as, that for mirrors except the optical centre of, the lens which is taken to be the origin point., If object distance = u , image distance = v, and focal length = f , then from the lens, formula, we have, 1-1 = 1, v u, f, 9. For a linear object placed normal to the, principal axis of a spherical lens, linear, magnification of a lens is stated as follows:, Linear magnification of a lens,, Height of the (hl), m =, Height of the object (h), Distance of the image (v), , =, Distance of the object (u), Linear magnification is negative for a real, image but positive for a virtual image., , 6.11 Power of a Lens, It is a measure of its degree of convergence or, divergence of light rays incident on it. It is also, defined as reciprocal of its focal length., Power of a lens,, 1, (P) =, Focal length of the lens (in metre), 1, =, f (in m), The SI unit of power of a lens is dioptre (D),, where 1 D = 1 m−1 ., The power of convex lens is taken positive, but power of concave lens is taken negative., 1. When two or more thin lenses of powers, P1, P2, P3, ..... are brought in contact, then, Combined power,, P = P1 + P2 + P3 + ....., 1 = 1 + 1 + 1 + ....., f, f1 f2 f3,
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******, , 8. Lenses are used in spectacles, different optical, instruments such as microscope, telescope,, photographic camera, film projector, etc., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 163, ,

mulitiple choice QUESTION, , 1., , What is the frequency of violet colour of, c?, wavelength 4000 A, 10, (a) 7.5 # 10 Hz, (b) 7.5 # 1012 Hz, (c) 7.5 # 1014 Hz, (d) 3.75 # 1016 Hz, , (a), (b), (c), (d), , 5., , Don’t Take Printout of This File because, this is not useful. You can purchase hard, book from Amazon. Hard book includes, explanation of all MCQs in print form., , What is the frequency of red colour of, c?, wavelength 8000 A, (a) 3.75 # 1014 Hz, (b) 3.75 # 1012 Hz, (c) 3.75 # 1016 Hz, (d) none of these, , Light enters from air to glass having, refractive index 1.50. The speed of light in, vacuum is 3 # 108 ms-1 . The speed of light, in the glass is(a) 2 # 108 ms-1, (b) 3 # 108 ms-1, (c) 4 # 10 4 ms-1, (d) 5 # 105 ms-1, , Sol : www.cbse.site/sc/gm102, , Sol : www.cbse.site/sc/gm106, , The refractive index of glass is 3/2. The, velocity of light in glass is, (a) 3 # 108 m/s, (b) 2 # 108 m/s, (c) 108 m/s, (d) 1.33 # 108 m/s, , 7., , Sol : www.cbse.site/sc/gm103, , 4., , A concave mirror produces three times, magnified (enlarged) real image of an, object placed at 10 cm in front of it. Where, is the image located?, (a) 30 cm, (b) 40 cm, (c) - 30 cm, (d) - 40 cm, Sol : www.cbse.site/sc/gm105, , 6., , 3., , cm, cm, cm, cm, , Sol : www.cbse.site/sc/gm104, , Sol : www.cbse.site/sc/gm101, , 2., , 10, 20, 30, 40, , The radius of curvature of a spherical, mirror is 20 cm. the focal length of mirror, is-, , A convex lens forms a real and inverted, image of a needle at a distance of 50 cm, from it. Where is the needle placed in front, of the convex lens if the image is equal to, the size of the object?, (a) 0.25 m, (b) 0.30 m, (c) 0.35 m, (d) 0.40 m, Sol : www.cbse.site/sc/gm107, , 8., , The power of a concave lens of focal length, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 164, , of 2, (a), (b), (c), (d), , Reflection and Refraction, , m is0.5 D, - 0.5 D, 1D, -1 D, , Sol : www.cbse.site/sc/gm108, , 9., , Which one of the following materials cannot, be used to make a lens?, (a) Water, (b) Glass, (c) Plastic, (d) Clay, Sol : www.cbse.site/sc/gm109, , 10. The image formed by a concave mirror is, observed to be virtual, erect and larger than, the object. Where should be the position of, the object?, (a) Between the principal focus and the, centre of curvature, (b) At the centre of curvature, (c) Beyond the centre of curvature, (d) Between the pole of the mirror and its, principal focus., Sol : www.cbse.site/sc/gm110, , Chap 6, , have each a focal length of - 15 cm . The, mirror and the lens are likely to be(a) both concave, (b) both convex, (c) the mirror is concave and the lens is, convex, (d) the mirror is convex, but the lens is, concave, Sol : www.cbse.site/sc/gm112, , 13. No matter how far you stand from a mirror,, your image appears erect. The mirror is, likely to be(a) Plane, (b) Concave, (c) Convex, (d) Either plane or convex, Sol : www.cbse.site/sc/gm113, , 14. Which of the following lenses would you, prefer to use while reading small letters, found in a dictionary?, (a) A convex lens of focal length 50 cm., (b) A convex lens of focal length 50 cm., (c) A convex lens of focal length 5 cm., (d) A concave lens of focal length 5 cm., Sol : www.cbse.site/sc/gm114, , 11. Where should an object is placed in front, of a convex lens to get a real image of the, size of the object?, (a) At the principal focus of the lens, (b) At twice the focal length, (c) At infinity, (d) Between the optical centre of the lens, and its principal focus., Sol : www.cbse.site/sc/gm111, , 12. A spherical mirror and a thin spherical lens, , 15. A concave lens of focal length 15 cm forms, as image 10 cm from the lens. How far is, the object placed from the lens?, (a) - 20 cm, (b) 40 cm, (c) - 30 cm, (d) - 40 cm, Sol : www.cbse.site/sc/gm115, , 16. An object is placed at a distance of 10 cm, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 165, , from a convex mirror of focal length 15 cm., the position of the image is(a) 6 cm, (b) 9 cm, (c) 8 cm, (d) 7 cm, , of power + 1.5 D . The focal length of the, lens is(a) 67 cm, (b) 70 cm, (c) 40 cm, (d) 65 cm, , Sol : www.cbse.site/sc/gm116, , Sol : www.cbse.site/sc/gm120, , 17. An object 5.0 cm in length is placed at, a distance of 20 cm in front of a convex, mirror or radius of curvature 30 cm. The, position of the image is(a) 8.57 cm, (b) 9.10 cm, (c) 8.15 cm, (d) 7.15 cm, , 21. The angle between incident ray and, reflected ray is 60c. What is the angle of, incidence?, (a) 30c, (b) 40c, (c) 60c, (d) 50c, Sol : www.cbse.site/sc/gm121, , Sol : www.cbse.site/sc/gm117, , 18. An object of size 7.0 cm is placed at 27 cm, in front of a concave mirror of focal length, 18 cm. At what distance from the mirror, should a screen be placed, so that a sharp, focussed image can be obtained?, (a) 54 cm, (b) 60 cm, (c) - 54 cm, (d) - 60 cm, , 22. When an incident ray makes an angle of, 40c with a normal to the air glass interface, of the rectangular glass slab. The value of, angle of emergence is(a) 30c, (b) 60c, (c) 90c, (d) 40c, Sol : www.cbse.site/sc/gm122, , Sol : www.cbse.site/sc/gm118, , 19. The, is(a), (b), (c), (d), , focal length of a lens of power - 2.0 D, - 50 cm, 40 cm, 50 cm, - 40 cm, , 23. The speed of light in a transparent medium, is 0.6 times that of its speed in vacuum., The refractive index of the medium is:, (a) 1.66, (b) 1.96, (c) 1.26, (d) 1.29, Sol : www.cbse.site/sc/gm123, , Sol : www.cbse.site/sc/gm119, , 20. A doctor has prescribed a corrective lens, , 24. The focal length of a convex mirror is, 12.5 cm. How far is its centre of curvature, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 166, , Reflection and Refraction, , from the pole?, (a) 25 cm, (b) 30 cm, (c) 40 cm, (d) 50 cm, Sol : www.cbse.site/sc/gm124, , Chap 6, , 28. A ray of light is refracted as per the, following diagram. Which of the following, medium is optically denser?, (a) Medium A, (b) Medium B, (c) Cannot be identify, (d) Both medium are denser, Sol : www.cbse.site/sc/gm128, , 25. An object is placed at a distance of 30 cm, from a convex mirror, the magnification, produced is 1 . Where should the object be, 2, placed to get the magnification of 1 ?, 3, (a) - 60 cm, (b) 40 cm, (c) 50 cm, (d) 60 cm, Sol : www.cbse.site/sc/gm125, , 26. An object is kept in front of a concave, mirror of focal length 20 cm. The image, is three times the size of the object. The, possible distances of the object from the, mirror is(a) - 80, 3, 40, (b), 3, (c) - 50, 3, (d) - 10, 3, Sol : www.cbse.site/sc/gm126, , 27. A ray of light falls normally on the surface, of a transparent glass slab. The angle of, emergence is(a) 0c, (b) 90c, (c) 45c, (d) 70c, Sol : www.cbse.site/sc/gm127, , 29. In an experiment with a rectangular glass, slab, a student observed that a ray of light, incident at an angle of 55c with the normal, on one face of the slab, after refraction, strikes the opposite face of the slab before, merging out into air making an angle of 40c, with the normal. What value would you, assign to the angle of refraction and angle, of emergence?, (a) 40c, 55c, (b) 55c, 40c, (c) 10c, 20c, (d) 40c, 90c, Sol : www.cbse.site/sc/gm129, , 30. With respect to air, the refractive index of, ice is 1.31 and that of rock salt is 1.54. the, refractive index of rock salt with respect to, ice is(a) 1.25, (b) 1.18, (c) 1.90, (d) 1.40, Sol : www.cbse.site/sc/gm130, , 31. The refractive index of a medium ‘x’ with, respect to ‘y’ is 2 and the refractive index, 3, of medium ‘y’ with respect to ‘z’ is 4 . The, 3, refractive index of medium ‘z’ with respect, of ‘x’ is-, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 167, , 2, 9, (b) 9, 8, (c) 1, 3, (d) 5, 6, Sol : www.cbse.site/sc/gm131, (a), , 35. A convex lens of focal length 25 cm and, a concave lens of focal length 10 cm are, placed in close contact with each other., The power of this combination is(a) 2 D, (b) 6 D, (c) - 6 D, (d) 9 D, Sol : www.cbse.site/sc/gm135, , 32. For the same angle of incidence in media P,, Q and R, the angles of refraction are 45c,, 35c and 15c respectively. In which medium, will the velocity of light be minimum?, (a) P, (b) Q, (c) R, (d) Q and R, Sol : www.cbse.site/sc/gm132, , 33. When light enters from air to glass, the, angles of incidence and refraction in air, and glass are 45c and 30c respectively., The refractive index of glass is (Given that, sin 45c = 1 , sin 30c = 1 ), 2, 2, (a), (b), (c), (d), , 1.90, 1.41, 1.20, 1.55, , Sol : www.cbse.site/sc/gm133, , 34. Two thin lenses of power + 3.5 D and, - 2.5 D are placed in contact. The power of, the lens combination is(a) + 1 D, (b) + 1.5 D, (c) + 2.5 D, (d) + 2 D, Sol : www.cbse.site/sc/gm134, , 36. The power of a combination of two lenses, XY is 5 D if the focal length of lens X is, 15 cm. The focal length of lens Y is(a) 60 cm, (b) - 60 cm, (c) 50 cm, (d) - 10 cm, Sol : www.cbse.site/sc/gm136, , 37. A student wants to project the image of, a candle flame on a screen 80 cm in front, of a mirror by keeping the candle flame, at a distance of 20 cm from its pole. The, magnification of the image produced is(a) - 4, (b) - 2, (c) - 6, (d) - 1, Sol : www.cbse.site/sc/gm137, , 38. A 4.5 cm needle is placed 12 cm away from, a convex mirror of focal length 15 cm. The, location of the image is(a) 6.7 cm, (b) 4.5 cm, (c) 9.2 cm, (d) 5 cm, Sol : www.cbse.site/sc/gm138, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 168, , Reflection and Refraction, , 39. If the speed of light in vacuum is, 3 # 108 m/s , the absolute refractive index, of a medium in which light travels with a, speed of 1.4 # 108 m/s is, (a) 2.14, (b) 3.14, (c) 4.15, (d) 1.14, Sol : www.cbse.site/sc/gm139, , 40. An object of height 6 cm is placed, perpendicular to the principal axis of a, concave lens of focal length 5 cm. If the, distance of the object from the lens is, 10 cm. The position of image is:, (a) 10 cm, 3, (b), , - 10 cm, 3, , (c), , 20 cm, 3, , Chap 6, , formed on a screen placed on the other side, of the lens at distance of 60 cm from the, optical centre of the lens. The focal length, of lens is(a) 40 cm, (b) 30 cm, (c) 50 cm, (d) 20 cm, Sol : www.cbse.site/sc/gm142, , 43. A 6 cm tall object is placed perpendicular, to the principal axis of a convex lens of, focal length 15 cm. The distance of the, object from the lens is 10 cm. The position,, of the image is(a) 20 cm, (b) 30 cm, (c) - 30 cm, (d) 50 cm, Sol : www.cbse.site/sc/gm143, , - 20 cm, 3, Sol : www.cbse.site/sc/gm140, (d), , 41. An object of height 5 cm is placed, perpendicular to the principal axis of a, concave lens of focal length 10 cm. If the, distance of the object from the optical, centre of the lens is 20 cm, the size of the, image is(a) 1.66 cm, (b) 2.16 cm, (c) 1.69 cm, (d) 2.91 cm, Sol : www.cbse.site/sc/gm141, , 44. A convex lens has a focal length of 10 cm., At what distance from the lens should the, object be placed so that it forms a real and, inverted image 20 cm away from the lens?, (a) - 20 cm, (b) - 40 cm, (c) - 60 cm, (d) - 80 cm, Sol : www.cbse.site/sc/gm144, , Don’t Take Printout of This File because, this is not useful. You can purchase hard, book from Amazon. Hard book includes, explanation of all MCQs in print form., , 42. The image of a candle flame placed at a, distance of 30 cm from a spherical lens is, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 169, , 45. The following figures show the path of light, rays through three lenses marked L1 , L2, and L 3 and their focal points F1 , F2 and F3, respectively., , refraction of light :, 1. The incident ray, refracted ray and the, normal ray lie in the same plane., 2. The angle of incidence is equal to the, angle of refraction., Choose the correct option from the codes, given below:, (a) Only 1, (b) Only 2, (c) Both 1 and 2, (d) Neither 1 nor 2, Sol : www.cbse.site/sc/gm146,
,
Ans :, (a) Only 1, According to the first laws of refraction of, light are :, “The incident ray, the refracted ray and the, normal to the interface of two transparent, media at the point of incidence, all lie in, the same plane”., According to the law of refraction the ratio, of sine of angle of incidence to the sine of, angle of refraction is constant, for the light, of a given colour and for the given pair of, media. This law is also known as Snell’s, law of refraction., 47. Which of the following are correctly, matched for the concave mirror?, Object, , Image, , 1. Between P and F at infinity, Which of the following diagram shows the, concave lens properties?, (a) (i), (b) (ii), (c) (iii), (d) (i), (ii), Sol : www.cbse.site/sc/gm145, , 46. Consider the following statements about, , 2. At C, , at C, , 3. Beyond C, , between F and C, , 4. At infinity, , at focus, , Choose the correct option from the codes, given below :, (a) 1, 3, 4, (b) 2, 3, 4, (c) 1, 2, 3, (d) 1, 2, 3, 4, Sol : www.cbse.site/sc/gm147, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 170, , Reflection and Refraction, , 48. As light travels from a rarer to a denser, medium it will have, (a) increased velocity, (b) decreased velocity, (c) decreased wavelength, (d) both (b) and (c), , 52. The, (a), (b), (c), (d), , Chap 6, , laws of reflection hold good for:, plane mirror only, concave mirror only, convex mirror only, All mirrors irrespective of their shape., , Sol : www.cbse.site/sc/gm152, , Sol : www.cbse.site/sc/gm148, , 49. The correct order of refractive index of, various materials is :, (a) Diamond 2 Ice 2 Alcohol 2 Rock, salt, (b) Ice 2 Diamond 2 Rock salt 2 Alcohol, (c) Diamond 2 Rock salt 2 Alcohol 2, Ice, (d) Rock salt 2 Alcohol 2 Ice 2 Diamond, , 53. The path of a ray of light coming from air, passing through a rectangular glass slab, traced by four students are shown in figure., Which one of them is correct?, , Sol : www.cbse.site/sc/gm149, , 50. A full length of a distant tall building can, definitely be seen by using, (a) a concave mirror, (b) a convex mirror, (c) a plane mirror, (d) both concave as well as plane mirror, Sol : www.cbse.site/sc/gm150, , 51. In torches, search light and headlights of, vehicles the bulb is placed, (a) Between the pole and focus of the, reflector, (b) Very near to the focus of the reflector, (c) Between the focus and centre of, curvature of the reflector, (d) At the centre of curvature of the, reflector, Sol : www.cbse.site/sc/gm151, , Sol : www.cbse.site/sc/gm153, , 54. You are given water, mustard oil, glycerine, and kerosene. In which of these media, a, ray of light incident obliquely at same angle, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 171, , would bend the most?, (a) Kerosene, (b) Water, (c) Mustard oil, (d) Glycerine, , Sol : www.cbse.site/sc/gm155, , Sol : www.cbse.site/sc/gm154, , 56. Which of the following ray diagrams is, correct for the ray of light incident on a, lens shown in Figure?, , 55. Which of the following ray diagrams is, correct for the ray of light incident on a, concave mirror as shown in Figure?, , Sol : www.cbse.site/sc/gm156, , 57. A child standing in front of a magic mirror., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 172, , Reflection and Refraction, , She finds the image of her head bigger, the, middle portion of her body of the same size, and that of the legs smaller. The following, is the order of combinations for the magic, mirror from the top., (a) Plane, convex and concave, (b) Convex, concave and plane, (c) Concave, plane and convex, (d) Convex, plane and concave, Sol : www.cbse.site/sc/gm157, , Chap 6, , angle of reflection, (b) Angle of incidence is less than the, angle of reflection, (c) Angle of incidence is greater than the, angle of reflection, (d) None of these, Sol : www.cbse.site/sc/gm161, , 62. Which of the following correctly represents, graphical relation between angle of, incidence (i) and angle of reflection (r)?, , 58. In which of the following, the image of, an object placed at infinity will be highly, diminished and point sized?, (a) Concave mirror only, (b) Convex mirror only, (c) Convex lens only, (d) Concave mirror, convex mirror,, concave lens and convex lens, Sol : www.cbse.site/sc/gm158, , 59. A thin layer of water is transparent but a, very thick layer of water is:, (a) translucent, (b) opaque, (c) most transparent, (d) none of these, Sol : www.cbse.site/sc/gm159, , 60. Air, (a), (b), (c), (d), , is not visible because it, is nearly a perfectly transparent, neither absorbs nor reflects light, transmits whole of light, all of the above are correct, , Sol : www.cbse.site/sc/gm160, , 61. According to laws of reflection of light, (a) Angle of incidence is equal to the, , Sol : www.cbse.site/sc/gm162, , 63. A concave mirror of focal length f (in air), , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 173, , is immersed in water (µ = 4/3). The focal, length of the mirror in water will be(a) f, (b) 4 f, 3, 3, (c), f, 4, (d) 7 f, 3, Sol : www.cbse.site/sc/gm163, , 64. Convergence of concave mirror can be, decreased by dipping in, (a) Water, (b) Oil, (c) Both, (d) None of these, Sol : www.cbse.site/sc/gm164, , 65. For, can, (a), (b), (c), (d), , a real object, which of the following, produce a real image, Plane mirror, Concave lens, Convex mirror, Concave mirror, , Sol : www.cbse.site/sc/gm165, , 66. If an object is placed 10 cm infront of a, concave mirror of focal length 20 cm, the, image will be, (a) Diminished, upright, virtual, (b) Enlarged, upright, virtual, (c) Diminished, inverted, real, (d) Enlarged, upright, real, Sol : www.cbse.site/sc/gm166, , 67. While using an electric bulb, the reflection, for street lighting should be from, (a) Concave mirror, , (b) Convex mirror, (c) Cylindrical mirror, (d) Parabolic mirror, Sol : www.cbse.site/sc/gm167, , 68. A convex mirror is used to form the image, of an object. Then which of the following, statement is wrong, (a) The image lies between the pole and, the focus, (b) The image is diminished in size, (c) The image is erect, (d) The image is real, Sol : www.cbse.site/sc/gm168, , 69. Image formed by convex mirror is(a) Virtual, (b) Real, (c) Enlarged, (d) Inverted, Sol : www.cbse.site/sc/gm169, , 70. The, (a), (b), (c), (d), , field of view is maximum for, Plane mirror, Concave mirror, Convex mirror, Cylindrical mirror, , Sol : www.cbse.site/sc/gm170, , 71. The image of the moon is formed by a, concave mirror whose radius of curvature, is 4.8 m at a time when distance from the, moon is 2.4 # 108 m . If the diameter of the, image is 2.2 cm, the diameter of the moon, is(a) 1.1 # 10 6 m, (b) 2.2 # 10 6 m, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 174, , Reflection and Refraction, , (c) 2.2 # 108 m, (d) 2.2 # 1010 m, , (c) Frequency and velocity, (d) Wavelength and velocity, , Sol : www.cbse.site/sc/gm171, , Sol : www.cbse.site/sc/gm175, , 72. The focal length of a concave mirror is f, and the distance of the object from the, principal focus is a . The magnitude of, magnification obtained will be(a) (f + a) /f, (b) f/a, (c), f/ a, 2, (d) f /a 2, Sol : www.cbse.site/sc/gm172, , 73. The magnification produced by a concave, mirror(a) is always more than one, (b) is always less than one, (c) is always equal to one, (d) may be less than or greater than one, Sol : www.cbse.site/sc/gm173, , 74. The ratio of the refractive index of red light, to blue light in air is(a) Less than unity, (b) Equal to unity, (c) Greater than unity, (d) Less as well as greater than unity, depending upon the experimental, arrangement, Sol : www.cbse.site/sc/gm174, , 75. When light travels from one medium to, the other of which the refractive index is, different, then which of the following will, change, (a) Frequency, wavelength and velocity, (b) Frequency and wavelength, , Chap 6, , 76. A beam of light propagating in medium A, with index of reflection n (A) passes across, an interface into medium B with index of, refraction n (B). The angle of incidence is, greater than the angle of refraction; v (A), and v (B) denotes the speed of light in A, and B . Then which of the following is true, (a) v (A) 2 v (B) and n (A) 2 n (B), (b) v (A) 2 v (B) and n (A) 1 n (B), (c) v (A) 1 v (B) and n (A) 2 n (B), (d) v (A) 1 v (B) and n (A) 1 n (B), Sol : www.cbse.site/sc/gm176, , 77. The refractive indices of glass and water, w.r.t. air are 32 and 43 respectively. the, refractive index of glass w.r.t. water will, be :, (a) 8, 9, (b) 9, 8, 7, (c), 6, (d) None of these, Sol : www.cbse.site/sc/gm177, , 78. An object is immersed in a fluid. In order, that the object becomes invisible, it should, (a) Behave as a perfect reflector, (b) Absorb all light falling on it, (c) Have refractive index one, (d) Have refractive index exactly matching, with that of the surrounding fluid, Sol : www.cbse.site/sc/gm178, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 175, , 79. When light travels from glass to air, the, incident angle is θ 1 and the refracted angle, is θ 2 . True relation is(a) q 1 = q 2, (b) q 1 1 q 2, (c) q 1 2 q 2, (d) Not predictable, Sol : www.cbse.site/sc/gm179, , 80. In vacuum the speed of light depends upon, (a) Frequency, (b) Wavelength, (c) Velocity of the source of light, (d) None of these, Sol : www.cbse.site/sc/gm180, , 81. If the central portion of a convex lens is, wrapped in black paper as shown in the, figure, , (a) No image will be formed by the, remaining portion of the lens, (b) The full image will be formed but it, will be less bright, (c) The central portion of the image will, be missing, (d) There will be two images each produced, by one of the exposed portions of the, lens, Sol : www.cbse.site/sc/gm181, , 82. A boy is standing in front of a plane mirror, at a distance of 3 m from it. What is the, distance between the boy and his image?, (a) 3 m, (b) 4.5 m, (c) 6 m, (d) None of these, Sol : www.cbse.site/sc/gm182, , 83. Choose the correct relation between u , v, and R for spherical mirrors., (a) R = 2uv, u+v, (b) R =, (c), , R=, , 2, u+v, 2 (u + v), (uv), , (d) None of these, Sol : www.cbse.site/sc/gm183, , 84. The image formed by a concave mirror is, real, inverted and of the same size as that, of the object. the position of the object, should be :, (a) Beyond C, (b) Between C and F, (c) At C, (d) At F, Sol : www.cbse.site/sc/gm184, , 85. A lens of focal power 0.5 D is:, (a) A convex lens of focal length 0.5 m, (b) A concave lens of focal length 0.5 m, (c) A convex lens of focal length 2 m, (d) A concave lens of focal length 2 m, Sol : www.cbse.site/sc/gm185, , 86. Where should an object be placed in front, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 176, , Reflection and Refraction, , of a convex lens to get a real image of the, size of the object?, (a) At the principle focus of the lens, (b) At twice focal length, (c) At infinity, (d) Between the optical centre of the lens, and its principle focus, , Chap 6, , 90. The inner shining surface of a steel spoon, serves as a, (a) Plane mirror, (b) Concave mirror, (c) Convex mirror, (d) Any one of the above, Sol : www.cbse.site/sc/gm190, , Sol : www.cbse.site/sc/gm186, , 87. A spherical mirror and a thin spherical lens, each has a focal length of - 15 cm . The, mirror and the lens are likely to be(a) Both concave, (b) Both convex, (c) The mirror is concave and lens is, convex, (d) The mirror is convex, but the lens is, concave, Sol : www.cbse.site/sc/gm187, , 88. A ray of light incident on a plane mirror, makes an angle of 20c with the mirror., Then the angle between the incident ray, and the reflected ray is(a) 70c, (b) 90c, (c) 120c, (d) 140c, Sol : www.cbse.site/sc/gm188, , 89. A ray of light incident normally on the, mirror, retraces its path on reflection., Which of the following is true?, (a) +i = +r = 90c, (b) +i + +r = 90c, (c) +i − +r = 0c, (d) +i = +r = 0c, Sol : www.cbse.site/sc/gm189, , 91. Which type of mirror is used by ENT, specialists as a ‘head mirror’ ?, (a) Plane mirror, (b) Convex mirror, (c) Concave mirror, (d) None of these, Sol : www.cbse.site/sc/gm191, , 92. When linear magnification is negative, the, image formed by a concave mirror must be(a) erect, (b) virtual, (c) real or virtual, (d) real and inverted, Sol : www.cbse.site/sc/gm192, , 93. In a convex mirror, focus (F ) and centre of, curvature (C ) of the mirror lie, (a) behind the mirror, (b) in front of the mirror, (c) on the mirror, (d) nothing can be decided, Sol : www.cbse.site/sc/gm193, , 94. A ray of light falls on a plane mirror making, an angle of 30c with normal. On deviation,, the ray of light deviates through an angle, of, (a) 120c, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 177, , (b) 140c, (c) 160c, (d) 180c, Sol : www.cbse.site/sc/gm194, , 95. The magnification of a concave mirror is, - 1. it implies that, (a) the object must be at the focus of the, concave mirror, (b) the image formed is virtual, (c) the image formed is erect, (d) none of these, , Sol : www.cbse.site/sc/gm196, , Sol : www.cbse.site/sc/gm195, , 96. An incident ray strikes a concave mirror, after passing through the focus (F ) as, shown in the figure., , 97. The magnification of a spherical mirror is, ! 2 . Then the mirror must be, (a) Plane, (b) Concave, (c) Convex, (d) Any one of these, Sol : www.cbse.site/sc/gm197, , Which of the following shows the correct, path of reflected rays?, , 98. A full length image of a distant tall building, can definitely be seen by using, (a) a concave mirror, (b) a convex mirror, (c) a plane mirror, (d) both concave as well as plane mirror, Sol : www.cbse.site/sc/gm198, , 99. Magnification produced by a rear view, mirror fitted in vehicles, (a) is less than one, (b) is more than one, (c) is equal to one, (d) can be more than or less than one, depending upon the position of the, object in front of it., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 178, , Reflection and Refraction, , Sol : www.cbse.site/sc/gm199, , Chap 6, , device X , by focusing the image of a far off, object on the screen positioned as shown in, figure The device X is a, , 100. SI unit of radius of curvature of a concave, mirror is, (a) - m, (b) m-1, (c) m, (d) None of these, Sol : www.cbse.site/sc/gm200, , 101. The rays from the sun converge at a point, 25 cm in front of a concave mirror. Where, should an object be kept so that size of its, image is equal to size of the object?, (a) 12.5 cm in front of the mirror, (b) 25 cm in front of the mirror, (c) 50 cm in front of the mirror, (d) between 25 cm and 30 cm in front of, the mirror, , (a), (b), (c), (d), , Convex lens, Concave lens, Convex mirror, Concave mirror, , Sol : www.cbse.site/sc/gm203, , Sol : www.cbse.site/sc/gm201, , 102. A student has to do the experiment on, finding the focal length of a given concave, mirror by using a distant object. Out of the, following set ups 1, 2, 3, 4 available to her., 1. a screen, a mirror holder and a scale., 2. a mirror holder, a screen holder and a, scale., 3. a screen holder and a scale., 4. a mirror holder and a screen holder., The set up that is likely to give her the best, result is the set-up labelled as:, (a) 1, (b) 2, (c) 3, (d) 4, , 104. Parallel rays from the top of a distant, object, incident on a concave mirror form, an image on the screen. The diagram, correctly showing the image of the object, on the screen in figure is:, , Sol : www.cbse.site/sc/gm202, , 103. A student determines the focal length of a, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 179, , spot, (a), (b), (c), (d), , is due toreflection of light, refraction of light, scattering of light, diffraction of light, , Sol : www.cbse.site/sc/gm205, , 106. A convex lens of focal length 20 cm is, placed in contact with a concave lens, of focal length 10 cm. The power of the, combination is(a) 10 dioptre, (b) - 10 dioptre, (c) - 5 dioptre, (d) 5 dioptre, Sol : www.cbse.site/sc/gm206, , 107. Which of the following figures shows, refraction of light while going from denser, to rarer medium?, , Sol : www.cbse.site/sc/gm204, , 105. Hold a concave mirror with its shining, surface towards the sun. Take a sheet of, paper and hold it in front of the mirror., Take the sheet of paper away from the, mirror gradually till a sharp, bright spot, appears on the paper. The sharp, bright, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 180, , Reflection and Refraction, , Sol : www.cbse.site/sc/gm207, , 108. Which of the following figures shows, no refraction of light when it is incident, normally on a boundary of two media?, , Chap 6, , Sol : www.cbse.site/sc/gm208, , 109. No refraction occurs at the boundary that, separates two media of equal refractive, indices. Which of the following figures, shows such type of refraction?, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 181, , Sol : www.cbse.site/sc/gm210, , 111. Which of the following correctly shows, refraction of a ray of light from a concave, lens?, , Sol : www.cbse.site/sc/gm209, , 110. Which of the following correctly shows, refraction of a ray of light from a convex, lens?, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 182, , Reflection and Refraction, , Chap 6, , a converging lens and its focal length (f )?, , Sol : www.cbse.site/sc/gm211, , 112. The focal length of a combination of convex, lens of power 1 D and concave lens of power, - 1.5 D is(a) - 2 m, (b) 2 m, (c) 2.5 m, (d) 0.5 m, Sol : www.cbse.site/sc/gm212, , 113. SI unit of power is(a) metre, (b) watt, (c) kilowatt, (d) dioptre, Sol : www.cbse.site/sc/gm213, Sol : www.cbse.site/sc/gm215, 114. Does the focal length of a lens change on, changing the object distance?, (a) Yes, always, (b) Yes, sometimes, (c) No, never, (d) Cannot say, Sol : www.cbse.site/sc/gm214, , 115. Which of the following graphs shows, correct variation between the power (P) of, , 116. Given below are a few steps (not in proper, sequence) followed in the determination, of focal length of a given convex lens by, obtaining a sharp image of a distant objectA. Measure the distance between the lens, and screen., B. Adjust the position of the lens to form, a sharp image., C. Select a suitable distant object., D. Hold the lens between the object and, the screen with its faces parallel to the, screen the correct sequence of steps for, determination of focal length is:, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , (a), (b), (c), (d), , Reflection and Refraction Page 183, , C,, C,, C,, A,, , A,, D,, A,, B,, , D, B, B, A, B, D, C, D, , Sol : www.cbse.site/sc/gm216, , 117. A student obtains a blurred image of an, object on a screen by using a convex lens., In order to obtain a sharp image of the, same object on the screen, he will have to, shift the lens, (a) to a position very far away from the, screen., (b) little away from the screen., (c) towards the screen., (d) either towards or away from the, screen depending upon the position of, the object., Sol : www.cbse.site/sc/gm217, , 118. Parallel rays from a distant object incident, on a convex lens form an image on the, screen. The diagram showing correctly the, image of the object on the screen in figure, is :, , Sol : www.cbse.site/sc/gm218, , 119. A student does the experiment on tracing, the path of a ray of light passing through, a rectangular glass slab for different angles, of incidence. He can get a correct measure, of the angles of incidence and the angle, of emergence by following the labelling, indicated in figure., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 184, , Reflection and Refraction, , Chap 6, , of student :, , Sol : www.cbse.site/sc/gm219, , 120. A student, while doing the experiment on, tracing the path of ray of light passing, through a rectangular glass slab, measured, the three angles marked as θ 1 , θ 2 and θ 3 in, figure. His measurements could be correct, if he were to find :, , (a), (b), (c), (d), , q1 1 q 2 1 q 3, q 1 1 q 2 , but q 1 = q 3, q1 2 q 2 2 3, q 1 2 q 2 but q 2 = q 3, , Sol : www.cbse.site/sc/gm221, , 122. The path of a ray of light passing through a, rectangular glass slab was traced and angles, measured. Which one out of the following, is the correct representation of an angle of, incidence i , angle of refraction r and angle, of emergence e as shown in the diagrams?, , Sol : www.cbse.site/sc/gm220, , 121. Four students showed the following traces, of the path of a ray of light passing through, a rectangular glass slab., The trace most likely to be correct is that, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 185, , (b), (c), (d), , 2, 3, 1, 2, 2, , Sol : www.cbse.site/sc/gm224, (a), (b), (c), (d), , I, II, III, IV, , Sol : www.cbse.site/sc/gm222, , 123. Which of the following can make a parallel, beam of light when light from a point, source is incident on it?, (a) Concave mirror as well as convex lens., (b) Convex mirror as well as concave lens., (c) Two plane mirrors placed at 90c to, each other., (d) Concave mirror as well as concave, lens., , 125. A light ray enters from medium A to medium, B as shown in figure. The refractive index, of medium A relative to B will be(a) greater than unity, (b) less than unity, (c) equal to unity, (d) zero, Sol : www.cbse.site/sc/gm225, , 126. Beams of light are incident through the, holes A and B and emerge out of box, through the holes C and D respectively, as shown in figure. Which of the following, could be inside the box?, , Sol : www.cbse.site/sc/gm223, , 124. Figure shows a ray of light as it travels from, medium A to medium B . Refractive index, of the medium B relative to medium A is(a), (b), (c), (d), , A, A, A, A, , rectangular glass slab, convex lens, concave lens, prism, , Sol : www.cbse.site/sc/gm226, , (a), , 3, 2, , 127. A beam of light is incident through the, holes on side A and emerges out of the, holes on the other face of the box as shown, in figure. Which of the following could be, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 186, , Reflection and Refraction, , inside the box?, , be, (a), (b), (c), (d), , Chap 6, , 8.35, 9.35, 7.35, 8.25, , Sol : www.cbse.site/sc/gm230, , (a), (b), (c), (d), , Concave lens, Rectangular glass slab, Prism, Convex lens, , Sol : www.cbse.site/sc/gm227, , 128. In which of the following, the image of, an object placed at infinity will be highly, diminished and point-sized?, (a) Concave mirror only, (b) Convex mirror only, (c) Convex lens only, (d) Concave mirror, convex mirror,, concave lens and convex lens, Sol : www.cbse.site/sc/gm228, , 129. An object is at a distance of 0.5 m in front, of a plane mirror. Distance between the, object and image is(a) 0.5 m, (b) 1 m, (c) 0.25 m, (d) 1.5 m, Sol : www.cbse.site/sc/gm229, , 130. A watch shows time as 3.25. When seen, through a mirror, the time will appear to, , 131. Given a point source of light, which of the, following can produce a parallel beam of, light?, (a) Convex mirror, (b) Concave mirror, (c) Concave lens, (d) Two plane mirrors inclined at an angle, of 90c, Sol : www.cbse.site/sc/gm231, , 132. A Convex mirror has a focal length f . A, real object placed at a distance f in front, of it from the pole produces an image at, (a) infinity, (b) f, f, (c), 2, (d) 2f, Sol : www.cbse.site/sc/gm232, , 133. The minimum distance between the object, and its real image for a concave mirror is(a) f, (b) 2f, (c) 4f, (d) zero, Sol : www.cbse.site/sc/gm233, , 134. A plane glass slab is kept over various, coloured letters. The letter, which appears, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 187, , least raised, is(a) blue, (b) violet, (c) green, (d) red, Sol : www.cbse.site/sc/gm234, , 135. If the rays constituting the beam actually, meet at a point or appear to meet at a, point, then the beam is:, (a) divergent, (b) convergent, (c) parallel, (d) equal, Sol : www.cbse.site/sc/gm235, , 136. What is the power of a concave lens whose, focal length is - 75.0 cm ?, (a) 1.33 D, (b) - 13.3 D, (c) 13.3 D, (d) - 1.33 D, Sol : www.cbse.site/sc/gm236, , Sol : www.cbse.site/sc/gm237, , 138. A concave lens always gives a virtual image., In optical lenses worn by humans which of, the following statements is true?, (a) The lens can never be concave., (b) In some cases the lens can be concave, if the focal length is much larger than, 2.5 cm., (c) All focal length concave lenses are, possible., (d) All focal length convex lenses are, possible., Sol : www.cbse.site/sc/gm238, , 137. Which of the following ray diagram is, correct?, , 139. Amount of light entering into the camera, depends upon:, (a) focal length of objective lens., (b) product of focal length and diameter, of objective lens., (c) distance of objective form camera., (d) aperture setting of the camera., Sol : www.cbse.site/sc/gm239, , 140. When sun rays are focussed with a convex, lens, a sharp, bright spot is observed at its, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 188, , Reflection and Refraction, , focus. What does this spot indicate?, (a) The real image of the sun., (b) The virtual image of the sun., (c) An optical illusion produced by the, convex lens., (d) The magnified image of the sun., , 144. The, (a), (b), (c), (d), , Chap 6, , radius of curvature of plane mirror is, infinite, zero, + 5 cm, - 5 cm, , Sol : www.cbse.site/sc/gm244, , Sol : www.cbse.site/sc/gm240, , 141. A convex lens has a focal length of 0.5 m., It has to combined with a second lens, so, that the combination has a power of 1.5, dioptre. Which of the following could be, the second lens?, (a) A concave lens of focal length 2 m., (b) Another convex lens of focal length, 0.5 m ., (c) A convex lens of focal length 0.5 m., (d) A convex lens of focal length 2 m., Sol : www.cbse.site/sc/gm241, , 142. When a ray of light enters a glass slab its, wavelength, (a) decreases, (b) increases, (c) remains unchanged, (d) data are not complete, Sol : www.cbse.site/sc/gm242, , 143. When light travels from one medium to, another which of the following factors, changes?, (a) Wavelength, (b) Frequency, (c) Amplitude, (d) None of these, Sol : www.cbse.site/sc/gm243, , 145. If a glass rod is immersed in a liquid of the, same refractive index, then it will, (a) disappear, (b) look bent, (c) look longer, (d) look shorter, Sol : www.cbse.site/sc/gm245, , 146. An object is immersed in a fluid. In order, that the object becomes invisible, it should, (a) have refractive index one, (b) absorb all light falling on it, (c) behave as a perfect reflector, (d) have refractive index exactly matching, with that of the surrounding fluid, Sol : www.cbse.site/sc/gm246, , 147. A beam of light composed of red and green, rays is incident obliquely at a point on, the face of a rectangular glass slab. When, coming out on the opposite parallel face,, the red and green rays emerge from, (a) one point propagating in the same, direction., (b) one point propagating in two different, directions., (c) two points propagating in two different, parallel directions., (d) two points propagating in two different, non-parallel directions., Sol : www.cbse.site/sc/gm247, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 189, , 148. Light appears to travel in a straight line,, because, (a) frequency of light is very small, (b) wavelength of light is very small, (c) light consists of very small particles, (d) velocity is different for different, colours, Sol : www.cbse.site/sc/gm248, , 149. The velocity of light in vacuum can be, changed by changing, (a) amplitude, (b) frequency, (c) wavelength, (d) medium, , (b) if object is placed close to the mirror., (c) if rays incident on mirror are parallel., (d) if rays incident on mirror are, converging., Sol : www.cbse.site/sc/gm252, , 153. When two converging lenses of same focal, length f are placed in contact, the focal, length of the combination is, (a) f, (b) 2f, f, (c), 2, (d) 3f, Sol : www.cbse.site/sc/gm253, , Sol : www.cbse.site/sc/gm249, , 150. The velocity of light is maximum in a, medium of, (a) glass, (b) water, (c) vacuum, (d) diamond, Sol : www.cbse.site/sc/gm250, , 151. A man runs towards a mirror with a speed, of 15 m-s-1 . What is the speed of his image, ?, (a) 7.5 m-s-1, (b) 15 m-s-1, (c) 30 m-s-1, (d) 45 m-s-1, Sol : www.cbse.site/sc/gm251, , 152. The light reflected by a plane mirror will, form a real image, (a) under no circumstances., , 154. A plane mirror produces a magnification of, (a) 0, (b) - 1, (c) + 1, (d) between 0 and + 1, Sol : www.cbse.site/sc/gm254, , 155. If a ray of light is incident on a plane mirror, at an angle of 30c, then deviation produced, by the plane mirror is, (a) 30c, (b) 60c, (c) 90c, (d) 120c, Sol : www.cbse.site/sc/gm255, , 156. An object is placed at a distance f in the, front of a convex mirror. If focal length, of the mirror is f , then distance of image, from pole of the mirror is, (a) f, (b) 2f, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 190, , Reflection and Refraction, , f, 2, f, (d), 4, Sol : www.cbse.site/sc/gm256, (c), , 157. The refractive indices of water and glass, are 1.2 and 1.5 respectively. What will be, the refractive index of glass with respect to, water ?, (a) 1.75, (b) 1.25, (c) 0.8, (d) 0.6, , Chap 6, , (d) - 1.5 D, Sol : www.cbse.site/sc/gm260, , 161. A point source of light P is placed at a, distance L in front of a mirror of width d, hung vertically on a wall. A man walks in, front of the mirror along a line parallel to, the mirror at a distance 2L as shown in the, figure. The greatest distance over which he, can see the image of the light source, in the, mirror, is, , Sol : www.cbse.site/sc/gm257, , 158. The velocity of light in a medium is, 2 # 108 m -s-1 . Refractive index of the, medium is, (a) 1, (b) 1.1, (c) 1.4, (d) 1.5, Sol : www.cbse.site/sc/gm258, , d, 2, (b) d, (c) 2d, (d) 3d, (a), , Sol : www.cbse.site/sc/gm261, 159. The power of combination of two lenses of, powers + 1.5 D and - 2.5 D is, (a) + 1.5 D, (b) - 2.5 D, (c) - 1 D, (d) + 1 D, Sol : www.cbse.site/sc/gm259, , 160. A convex lens of focal length 40 cm is in, contact with a concave lens of focal length, 25 cm. The power of the combination is, (a) - 6.5 D, (b) + 6.5 D, (c) + 6.67 D, , 162. If the refractive index of a medium is 1.2,, then light will pass through this medium, with a velocity of, (a) 2.5 # 108 m -s-1, (b) 3 # 108 m -s-1, (c) 3.6 # 108 m -s-1, (d) 4.8 # 108 m -s-1, Sol : www.cbse.site/sc/gm262, , 163. A candle placed 25 cm from a lens, forms, an image on a screen placed 75 cm on the, other end of the lens. The focal length and, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , type, (a), (b), (c), (d), , Reflection and Refraction Page 191, , of the lens should be, + 18.75 cm and convex lens, - 18.75 cm and concave lens, + 20.25 cm and convex lens, - 20.25 cm and concave lens, , Sol : www.cbse.site/sc/gm263, , 164. The, (a), (b), (c), (d), , power of a plane glass is, zero, 1D, 2D, infinity, , Sol : www.cbse.site/sc/gm264, , 165. If the power of a lens is + 5 D , then its focal, length is, (a) + 0.2 cm, (b) - 0.2 cm, (c) + 20 cm, (d) - 20 cm, , (c) 20 cm, (d) 40 cm, Sol : www.cbse.site/sc/gm267, , 168. The projection lens of a projector has focal, length 5 cm. It is desired to get an image, with a magnification 30. The distance of, the screen from the lens must be, (a) 0.3 m, (b) 0.8 m, (c) 1.55 m, (d) 2.55 m, Sol : www.cbse.site/sc/gm268, , 169. A convex lens has a focal length f . It is, cut into two parts along the dotted line, as shown in the figure. The focal length of, each part will be, , Sol : www.cbse.site/sc/gm265, , 166. A combination of a concave and convex, lens has power 5 D . If the power of convex, lens is 4 D , then focal length of the concave, lens is, (a) 10 cm, (b) 20 cm, (c) 100 cm, (d) 200 cm, Sol : www.cbse.site/sc/gm266, , 167. If two lenses of power 2 D and 3 D are, kept in contact with each other, then focal, length of the combination will be, (a) 5 cm, (b) 10 cm, , f, 2, (b) f, 3f, (c), 2, (d) 2f, (a), , Sol : www.cbse.site/sc/gm269, , 170. The radius of curvature of concave mirror, is 24 cm. Then, the focal length will be, (a) - 12 cm, (b) 6 cm, (c) - 24 cm, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 192, , Reflection and Refraction, , Chap 6, , (d) - 6 cm, Sol : www.cbse.site/sc/gm270, , 171. An object is placed 20 cm from the concave, mirror of focal length 10 cm, then image is, formed at, (a) centre of curvature of mirror, (b) behind the mirror, (c) between the mirror and focus, (d) at focus, , 174. The angle of incidence and angle of, reflection in the following diagram., , Sol : www.cbse.site/sc/gm271, , 8, , 172. Velocity of light in air is 3 # 10 m/s . While, its velocity in a medium is 1.5 # 108 m/s ., Then, refractive index of this medium is, (a) 3, (b) 5, (c) 0.5, (d) 2, Sol : www.cbse.site/sc/gm272, , 173. A virtual image three times the size of the, object is obtained with a concave mirror of, radius of curvature 24 cm. The distance of, the object from the mirror is, (a) 20 cm, (b) 10 cm, (c) 12 cm, (d) 5 cm, Sol : www.cbse.site/sc/gm273, , Don’t Take Printout of This File because, this is not useful. You can purchase hard, book from Amazon. Hard book includes, explanation of all MCQs in print form., , (a), (b), (c), (d), , 45c,, 55c,, 60c,, 30c,, , 40c, 55c, 60c, 30c, , Sol : www.cbse.site/sc/gm274, , 175. One light wave is incident upon a plate of, refracting index µ . Incident angle i , for, which refractive and reflective waves are, mutually perpendicular will be, (a) i = 45c, (b) i = sin−1 (µ), (c) i = cosec−1 (µ), (d) i = tan−1 (µ), Sol : www.cbse.site/sc/gm275, , 176. An object is situated at a distance of, f/2 from a convex lens of focal length f ., Distance of image will be, (a) + (f/2), (b) + (f/3), (c) + (f/4), (d) - f, Sol : www.cbse.site/sc/gm276, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 193, , 177. Light rays A and B fall on optical, component X and come out as C and D ., , (c), , Light waves are refracted by some, materials., (d) Light waves are emitted by some, materials., Sol : www.cbse.site/sc/gm279, , The, (a), (b), (c), (d), , optical component is a, concave lens, convex lens, convex mirror, prism, , Sol : www.cbse.site/sc/gm277, , 178. If the refractive indices for water and, diamond relative to air are 1.33 and 2.4, respectively, then the refractive index of, diamond relative to water is(a) .55, (b) 1.80, (c) 3.19, (d) None of these, Sol : www.cbse.site/sc/gm278, , 179. Which statement best describes the, property of light waves illustrated in the, diagram below?, , 180. Assertion : Convex mirror is used as a rear, view mirror., Reason : Convex mirror always forms, inverted image., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm280, , 181. Assertion : Refractive indices of all, transparent mediums are more than 1, (except air)., Reason : Air is the rarest medium., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm281, , (a) Some materials absorb light waves., (b) Some materials refracted by some, materials., , 182. Assertion : When light travels from one, medium to another. The direction of, propagation of light in second medium, changes., Reason : Light travels with different speeds, in different mediums., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 194, , Reflection and Refraction, , (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm282, , 183. Assertion : Radius of curvature of a, spherical minor is half its focal length., Reason : A ray of light incident parallel, to principal axis after reflection passes, through C ., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm283, , 184. Assertion : After refraction though a, rectangular glass slab, emergent ray is, parallel to the direction of incident ray., Reason : Refractive indices of air and glass, are different., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm284, , Chap 6, , 185. Assertion : Magnification of real images is, taken negative., Reason : Magnification is ratio of image, distance and object distance., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm285, , 186. Assertion : On moving from optically rarer, to denser medium, a ray of light bends, away from the normal., Reason : Speed of light is more in denser, medium and less in rarer medium., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm286, , 187. Assertion : When light from sun is focussed, on a sheet of paper using a convex lens, the, paper begins to burn producing smoke. It, may even catch fire after a while., Reason : Convex lens is a converging lens., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 195, , (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm287, , (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm290, , 188. Assertion : Power of a convex lens is positive, and that of a concave lens is negative., Reason : Convex lens forms real image and, concave lens forms virtual image., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm288, , 189. Assertion : Convex mirror is used as a, shaving mirror., Reason : Convex minor always forms an, enlarged image., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm289, , 190. Assertion : A small source of light casts a, sharp shadow of an opaque object., Reason : Light travels in straight lines., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., , 191. Assertion : Concave mirror has a real focus., Reason : Concave mirror always forms real, image., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm291, , 192. Assertion : The twinkling of star is due to, reflection of light., Reason : The velocity of light changes while, going from one medium to the other., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm292, , 193. Assertion : For observing traffic at our, back, we prefer to use a convex mirror., Reason : A convex mirror has a much, larger field of view than a plane mirror or, a concave mirror., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 196, , Reflection and Refraction, , true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but Reason is true., Sol : www.cbse.site/sc/gm293, , 194. Assertion : A concave mirror of focal length, ‘f ’ in air is used in a medium of refractive, index 2. Then the focal length of mirror in, medium becomes double., Reason : The radius of curvature of a mirror, is double of the focal length., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm294, , 195. Assertion : Large concave mirrors are used, to concentrate sunlight to produce heat in, solar cookers., Reason : Concave mirror converges the, light rays falling on it to a point., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm295, , 196. Assertion : A ray incident along normal to, the mirror retraces its path., Reason : In reflection, angle of incidence is, , Chap 6, , not equal to angle of reflection., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm296, , 197. Assertion : When a concave mirror is held, under water, its focal length will decrease., Reason : The focal length of a concave, mirror is independent of the medium in, which it is placed., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true., Sol : www.cbse.site/sc/gm297, , 198. Assertion : Plane mirror may form virtual, image., Reason : Plane mirror forms virtual image,, if objects is real., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., Sol : www.cbse.site/sc/gm298, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 197, , 199. Assertion : An object is placed at a distance, of d from a convex mirror of focal length d,, its image will form at infinity., Reason : The distance of image in convex, mirror can never be infinity., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true., Sol : www.cbse.site/sc/gm299, , Sol : www.cbse.site/sc/gm301, , 202. Assertion : Refractive index has no units., Reason : The refractive index is a ratio of, two similar quantities., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true., Sol : www.cbse.site/sc/gm302, , 200. Assertion : The mirror used in search lights, are concave spherical., Reason : In concave spherical mirror the, image formed is always virtual., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true., Sol : www.cbse.site/sc/gm300, , 201. Assertion : For observing traffic at back,, the driver mirror is convex mirror., Reason : A convex mirror has much larger, field of view than a plane mirror., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true., ,

competency, , BASED QUESTION, , 203. Three students measured the focal length, of a convex lens using parallel rays from a, distant object. All of them measured the, distance between the lens and the inverted, image on the screen. Student A saw a, sharp image on the screen and labelled the, distance as f1 . Student B saw a slightly, larger blurred image on the screen and, labelled the distance as f 2 . Student C saw a, slightly smaller blurred image on the screen, and labelled at distance as f 3 . The relation, between the three measurements would not, likely be :, (a) f1 = f 2 = f 3, (b) f1 1 f 2 and f 3, (c) f 3 1 f1 1 f 2, (d) f 1 1 f 2 and f1 = f 3, Sol : www.cbse.site/sc/gm303,
,
Direction For Questions, (201-203), , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 198, , Reflection and Refraction, , A spherical mirror produces an image of, magnification - 1 on a screen placed at a, distance of 50 cm from the mirror, 204. The, (a), (b), (c), (d), , type of mirror isConcave, Convex, Plane convex, None of these, , Sol : www.cbse.site/sc/gm304, , Chap 6, , 5 - 18, , + 90, , 6 - 10, , + 100, , On the basis of the above table give the, answer of following questions., 207. The, (a), (b), (c), (d), , focal length of the convex lens is:, - 15, + 25, - 25, + 15, , Sol : www.cbse.site/sc/gm305, 205. The, is(a), (b), (c), (d), , distance of the image from the object, 50 cm, 100 cm, 150 cm, 200 cm, , Sol : www.cbse.site/sc/gm304, , 206. The, (a), (b), (c), (d), , focal length of the mirror is- 30 cm, 40 cm, 30 cm, - 25 cm, , Sol : www.cbse.site/sc/gm304,
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Direction For Questions, (204-208), A student performs the experiment with, a convex lens and he marked the table, between image distance (v) and object, distance (u)., Object distance, (u) (cm), , Image distance, ^v h (cm), , 1 - 90, , +18, , 2 - 60, , +20, , 3 - 30, , +30, , 4 - 20, , +60, , 208. In the table which observation is wrong?, (a) S.No. 1, (b) S.No. 4, (c) S.No. 3, (d) S.No. 6, Sol : www.cbse.site/sc/gm305, , 209. If a convex lens is used to focus sunlight on, a paper, where the paper should be placed, so that it catches fire., (a) At 25 cm away from lens, (b) At optical centre of lens, (c) At principal focus., (d) At centre of curvature, Sol : www.cbse.site/sc/gm305, , 210. The approximate value of magnification in, case of S.No. 4 is, (a) - 1, (b) - 3, (c) + 4, (d) + 1, Sol : www.cbse.site/sc/gm305, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , 211. The, (a), (b), (c), (d), , Reflection and Refraction Page 199, , image formed in case of S.No. 2 is, real and enlarged, real and diminished, virtual and diminished, virtual and enlarged, , Sol : www.cbse.site/sc/gm305,
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Direction For Questions, (209-213), Mohan is performing an experiment with, four different optical media, he traced the, path of light in different media P, Q, R and, S as below:, , optical density?, (a) P, (b) R, (c) S, (d) Q, Sol : www.cbse.site/sc/gm306, , 214. Through which media, will speed of light, be maximum?, (a) Q, (b) R, (c) S, (d) P, Sol : www.cbse.site/sc/gm306, , 215. Absolute refractive index of medium is, maximum in:, (a) P, (b) Q, (c) R, (d) S, Sol : www.cbse.site/sc/gm306, , 212. When a light travel from medium P to S, it will:, (a) reflect back to medium P, (b) pass straight without bending, (c) bend away from normal, (d) bend towards normal, Sol : www.cbse.site/sc/gm306, , 213. Which of the following media has maximum, , 216. Which is correct about absolute refractive, index of medium?, (a) P 2 Q, (b) R = Q, (c) S 2 P, (d) P = R, Sol : www.cbse.site/sc/gm306,
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Direction For Questions, (214-218), When a beam of light is incident from are, homogeneous medium on a shiny surface, of other medium, a part of it is returned, back into the same medium. The return of, light into the some medium after streaking, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 200, , Reflection and Refraction, , a surface is called reflection. The law of, reflection are following., Let us recall these laws:, (a) The angle of incidence is equal to the, angle of reflation, and, (b) The incident ray, the normal to the, mirror at the point of incidence and the, reflected ray, all lie in the same plane., These laws of reflection are applicable to, all types of reflecting surfaces including, spherical surfaces. You are familiar with, the formation of image by a plane mirror., What are the properties of the image?, Image formed by a plane mirror is always, virtual and erect. The size of the image, is equal to that of the object. The image, formed is as far behind the mirror as the, object is in front of it. Further, the image, is laterally inverted., 217. What is magnification produced by the, plane mirror if the size of object is 24 cm?, (a) - 24, (b) + 24, (c) - 1, (d) + 1, Sol : www.cbse.site/sc/gm307, , 218. If the angle of incidence of light on mirror, is 30c. The value of angle of reflection is, (a) 30c, (b) 45c, (c) 60c, (d) 90c, Sol : www.cbse.site/sc/gm307, , 219. The phenomenon of bouncing back of a ray, of light after striking to a surface is called, .......... ., (a) Dispersion of light, (b) Scattering of light, , Chap 6, , (c) Refraction of light, (d) Reflection of light, Sol : www.cbse.site/sc/gm307, , 220. Which of the following, phenomenon of reflection?, (a) A concave mirror, (b) A plane mirror, (c) A convex mirror, (d) All of these, , shows, , the, , Sol : www.cbse.site/sc/gm307, , 221. What is the formula for magnification, obtained with a plane mirror?, (a) Ratio of height of image to height of, object., (b) Inverse of image distance., (c) Inverse of object distance., (d) Ratio of height of object to height of, image., Sol : www.cbse.site/sc/gm307,
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Direction For Questions, (219-223), The ability of a lens to converge or diverge, light rays depends on its focal length. For, example, a convex lens of short focal length, bends the light rays through large angles,, by focussing them closer to the optical, centre. Similarly, concave lens of very short, focal length causes higher divergence than, the one with longer focal length. The degree, of convergence or divergence of light rays, achieved by a lens is expressed in terms of, its power. The power of a lens is defined, as the reciprocal of its focal length. It is, represented by the lefter P . The power P, of a lens of focal length f is given by, P =1, f, The SI unit of power of a lens is ‘dioptre’. It, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 201, , is denoted by the letter D . If f is expressed, in metres, then, power is expressed in, dioptres. Thus, 1 dioptre is the power, of a lens whose focal length is 1 metre., 1 D = 1 m−1 . The power of a convex lens, is positive and that of a concave lens is, negative., 222. Which one of the following lens is a, converging lens?, (a) Flat lens, (b) Bifocal lens, (c) Convex lens, (d) Concave lens, Sol : www.cbse.site/sc/gm308, , 223. The power of a diversing lens is 2.0 D. The, focal length of lens is:, (a) + 0.5 m, (b) - 50 cm, (c) + 500 mm, (d) - 40 cm, Sol : www.cbse.site/sc/gm308, , 224. The focal length of a lens is + 40 cm . The, power of lens is:, (a) + 5.0 D, (b) - 2.5 D, (c) + 9.5 D, (d) - 9.5 D, Sol : www.cbse.site/sc/gm308, , 225. The, (a), (b), (c), (d), , S.I. unit of power of a lens is:, Kwh, Meter, Watt, Dioptre, , Sol : www.cbse.site/sc/gm308, , 226. If the ratio of focal length of two convex, lenses is 1 : 5 then what is the ratio of their, power?, (a) 1 : 1, (b) 1 : 2, (c) 5 : 1, (d) 3 : l, Sol : www.cbse.site/sc/gm308,
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Direction For Questions, (224-228), If the position of object in front of the, mirror is changed, the size of image, changes. If the lengths of the object and, image are measured perpendicular to the, principle axis, the ratio of length of the, image to the length of the object is called, linear magnification it is represent by ‘m ’., The magnification m is also related to the, object distance and image distance. It can, be expressed as:, Magnification,, m = hl =− v, u, h, The height of the object is taken to be, positive as the object is usually placed, above the principal axis. The height of, the image should be taken as positive for, virtual images. However, it is to be taken, as negative for real images. A negative sign, in the value of the magnification indicates, that the image is real. A positive sign in, the value of the magnification indicates, that the image is virtual., 227. The magnification produced by a spherical, mirror of an object of 5 cm is 2. The size of, the image formed by this spherical mirror, will be:, (a) 20 cm, (b) 0.4 cm, (c) 2.5 cm, (d) 10 cm, Sol : www.cbse.site/sc/gm309, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 202, , Reflection and Refraction, , 228. A concave mirror forms a virtual image of, an object placed at a distance 20 cm. If the, size of the image is twice of the size of the, object then the image will be formed at a, distance:, (a) 40 cm, (b) 10 cm, (c) 20 cm, (d) 30 cm, Sol : www.cbse.site/sc/gm309, , 229. The magnification produced by a spherical, mirror is –2. What type of mirror is it?, (a) Either a convex or a concave mirror, (b) A plane mirror, (c) A convex mirror, (d) A concave mirror, , Chap 6, ,
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Direction For Questions, (229-233), Lenses are made of transparent material, usually glass, bounded by polished spherical, or cylindrical surface. This means that a lens, is bound by at least one spherical surface., In such lenses, the other surface would be, plane. A lens which is thickes at the middle, and thinner at the edge is convex lens. Is also, called converging lens. A convex lens is of, there types. i.e., biconvex, planoconvex and, convexo-concave lens. Similarly. a double, concave lens is bounded by two spherical, surfaces, curved inwards. It is thicker at, the edges than at the middle. Such lenses, diverge light rays. Such lenses are called, diverging lenses. A double concave lens is, simply called a concave lens, , Sol : www.cbse.site/sc/gm309, , 230. An object of size 5 cm is placed at a distance, of 20 cm in front of a concave mirror focal, length 10 cm. The distance of the image, from the mirror and its height will be:, (a) v =− 20 cm , hi =+ 5 cm, (b) v =+ 30 cm , hi =+ 5 cm, (c) v =+ 20 cm , hi =+ 10 cm, (d) v =− 20 cm , hi =− 5 cm, Sol : www.cbse.site/sc/gm309, , 231. The magnification produced by a spherical, mirror is + 1/2 . The image formed by the, mirror will be:, (a) Real, inverted and larger in size., (b) Virtual, erect and larger in size., (c) Virtual, erect and larger in size., (d) Virtual, erect and smaller in size., Sol : www.cbse.site/sc/gm309, , 232. The lens which is also called a diverging, lens is:, (a) Plano-convex lens, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 203, , 236. Which of the following lens is a diverging, lens?, , (b) Convex lens, (c) Concave lens, (d) Plano-concave lens, Sol : www.cbse.site/sc/gm310, , 233. Which of the following difference is correct, between a convex lens and a concave lens?, (a) A convex lens forms both real and, virtual images while a concave lens, forms only virtual images., (b) A convex lens is a converging lens, while a concave lens is a diverging, lens., (c) A convex lens is thick at the middle, and thin at the edges while a concave, lens is thin at the middle and thick at, the edges., (d) All of the above, Sol : www.cbse.site/sc/gm310, , 234. A transparent medium bounded by two, surfaces, atleast one of them is spherical is, called a:, (a) Lens, (b) Telescope, (c) Convex mirror, (d) Concave mirror, Sol : www.cbse.site/sc/gm310, Sol : www.cbse.site/sc/gm310, 235. Which of the following lens is called a, convex lens?, (a) A lens which is bounded by two, spherical surfaces, (b) A lens which is thicker at the middle, as compared to the edges, (c) A lens which converges light rays, (d) Both (b) and (c), Sol : www.cbse.site/sc/gm310, ,
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Direction For Questions, (234-238), Many optical instrument (like compound, microscope)having number of lenses which, are arranged is same specific manner, and it is increases the magnification and, sharpness of image which is formed by, optical instrument. The net power (P ) of, the lenses placed in contact is given by, the algebraic sum of the individual powers, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 204, , Reflection and Refraction, , P1, P2, P3, ..... as, P = P1 + P2 + P3 + ....., The use of powers, instead of focal lengths,, for lenses is quite convenient for opticians, During eye-testing, an optician puts several, different combinations of corrective lenses, of known power, in contact, inside the, testing spectacles frame. The optician, calculates the power of the lens required by, simple algebraic addition. For example, a, combination of two lenses of power + 2.0 D, and + 0.25 D is equivalent to a single lens, of power + 2.25 D . The simple additive, property of the powers of lenses can be used, to design lens systems to minimise certain, defects in images produced by a single lens., Such a lens system, consisting of several, lenses, in contact, is commonly used in the, design of camera lenses and the objectives, of microscopes and telescopes., 237. The power of a convex lens is 4.0 D. The, focal length of this lens will be:, (a) 0.5 m, (b) 0.25 m, (c) 2.5 m, (d) 5 m, Sol : www.cbse.site/sc/gm311, , 238. Two lenses of power 12 D and - 0.3 D are, in contact to each other. Their combined, power will be:, (a) + 0.2 D, (b) - 0.2 D, (c) + 0.5 D, (d) + 0.8 D, Sol : www.cbse.site/sc/gm311, , 239. Which of the following instrument consists, of a lens system consisting of two or more, , Chap 6, , lenses in contact?, (a) Microscope, (b) Telescope, (c) Camera, (d) All of the above, Sol : www.cbse.site/sc/gm311, , 240. The focal lengths of two lenses in contact to, each other are 20 cm and 50 cm respectively., Their combined power is:, (a) + 7.0 D, (b) + 70 D, (c) + 3.0 D, (d) + 30 D, Sol : www.cbse.site/sc/gm311, , 241. In many optical instruments, the lenses are, combined due to the following reason:, (a) to increase the magnification of the, image, (b) to increase sharpness of the image, (c) to get virtual images of the object, (d) Both (a) and (b), Sol : www.cbse.site/sc/gm311,
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Direction For Questions, (239-243), Lenses are objects made or transparent, materials such as glass or clear plastic that, has curved surfaces. Diverging lenses are, thicker at their edges than at their centres, and make light rays passing through them, spread out. Converging lenses are thicker in, middle than at edges and make light rays, passing through them focus at a point., These are used in spectacles to help people, with poor vision see better. The converging, lenses magnify by bending the rays or light, that pass through them to meet at a point, called focus. Thicker the converging lens, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 205, , is at its centre, the more it magnifies and, closer the focus is to the lens., , 244. The image represents the rays of light, travelling through a convex lens., , 242. Which relation of powers of lenses are, correct?, (a) P1 is positive and P2 is negative, (b) P1 > P2, (c) P1 < P2, (d) P1 = P2, Sol : www.cbse.site/sc/gm312, , 243. A beam of light is incident on the box, through the holes on side A and emerges, out of the holes on the other face of the box, as shown in the figure., , Which of the following could be inside the, box?, (a) Rectangular glass plate, (b) Prism, (c) Convex lens, (d) Concave lens, Sol : www.cbse.site/sc/gm312, , Don’t Take Printout of This File because, this is not useful. You can purchase hard, book from Amazon. Hard book includes, explanation of all MCQs in print form., , (a), (b), (c), (d), , Where is the image most likely to form?, Position S, Position P, Position Q, Position R, , Sol : www.cbse.site/sc/gm312, , 245. Rakhi conducts an experiment to produce, an image of an object on a screen which is, placed at 20 cm from the lens, She uses a convex lens of focal length 15 cm, for the experiment., Where should she place the object in order, to produce the sharpest image?, (a) 60 cm in front or the lens, (b) 15 cm in front or the lens, (c) 8 cm in front or the lens, (d) 20 cm in front or the lens, Sol : www.cbse.site/sc/gm312, , 246. Abhishek uses two lenses P and Q of same, size and same material as shown. P1 and P2, are the powers of P and Q . An object is, kept at the same distance from the lenses, between F and 2F of each lens on the, principal axis in turn. Let I1 and I2 be the, image formed by two lenses respectively., Which one of the following statements is, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 206, , Reflection and Refraction, , correct for the images formed?, , (a) Size of image I1 will be lesser than size, or image I2 ., (b) Size of image I1 will be equal to size or, image I2 ., (c) Distance of image I2 will be greater, than distance or image I1 from the, lens., (d) Distance of image I2 will be less than, distance or image I1 from the lens., Sol : www.cbse.site/sc/gm312,
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Direction For Questions, (244-248), The image formed by a convex lens depends, on the position of the object in front of the, lens. When the object is placed anywhere, between focus and infinity, the image, formed by convex lens is real and inverted., The image is not obtained on the screen, when the object is placed between focus, and the lens., The distance between the optical centre O, of the convex lens and the focus point F1 or, F2 is its focal length., When the object shifts from - 3 to F1 , the, image moves from F2 to + 3., , Chap 6, , image moves from - 3 to O ., , A student did an experiment with a convex, lens. He put an object at different distances, from the lens. In each case he measured the, distance of the image from the lens. The, results were recorded in the following table, Object distance 25, (in cm), Image distance, (in cm), , 30, , 40, , 60, , 120, , 100 24, , 60, , 30, , 40, , Unfortunately his results are written in the, wrong order., 247. A virtual image is formed by convex lens, when object is placed, (a) between F and O, (b) at infinity, (c) between C and F, (d) at F, Sol : www.cbse.site/sc/gm313, , 248. The minimum distance between an object, and its real image formed by a convex lens, is, (a) zero, (b) 2f, (c) 4f, (d) 3f, Sol : www.cbse.site/sc/gm313, , When the object shifts from F1 to O , the, , 249. Which of this object distances gives the, biggest image?, (a) 60 cm, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 207, , (b) 40 cm, (c) 30 cm, (d) 25 cm, , Object, , Sol : www.cbse.site/sc/gm313, , 250. The image distances in the correct order, (in cm) is, (a) 100, 60, 40, 30, 24, (b) 100, 60, 30, 40, 24, (c) 100, 24, 60, 40, 30, (d) 24, 30, 40, 60, 100, , focal length of this lens is, 10 cm, 20 cm, 30 cm, 40 cm, , Sol : www.cbse.site/sc/gm313,
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Direction For Questions, (249-253), A real image (always inverted) is the one, through which the rays of light actually, pass after reflection from concave mirror, and which can be formed on a screen. A, virtual image (always erect) is the one, through which the rays do not actually pass,, although they appear to come from it. The, position, nature and size of the image of an, object formed by a concave mirror changes, with the position of the object. The size of, image may be determined by using a graph, paper fixed on the screen., Object, , Image, , Nature of the, image, , u=3, , v=f, , Real, inverted, and highly, diminished, , Nature of the, image, , 3 > u > 2f 2f < v < 3 Real inverted, and diminished, u = 2f, , v = 2f, , 2f > u > f, , 2f < v < 3 Real inverted, and enlarged, , u=f, , v=3, , f>u>0, , Behind the Virtual, erect, mirror, and enlarged, , Sol : www.cbse.site/sc/gm313, , 251. The, (a), (b), (c), (d), , Image, , Real inverted, and same size, , Real inverted, and highly, enlarged, , 252. Which of the following mirror is used by a, dentist to examine a small cavity?, (a) Concave mirror, (b) Convex mirror, (c) Combination of (a) and (b), (d) None of these, Sol : www.cbse.site/sc/gm314, , 253. The image shows the path of incident rays, to a concave mirror., , Where would the reflected rays meet for, the image formation to take place?, (a) Between F and O, (b) Beyond C, (c) Between C and F, (d) Behind the mirror, Sol : www.cbse.site/sc/gm314, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 208, , Reflection and Refraction, , 254. A student conducts an activity using a, concave mirror with focal length of 10 cm., He placed the object 15 cm from the mirror., Where is the image likely to form?, (a) At 6 cm in front of the mirror, (b) At 6 cm behind the mirror, (c) At 30 cm behind the mirror, (d) At 30 cm in front of the mirror, Sol : www.cbse.site/sc/gm314, , 255. Rekha placed a juice bottle at a distance of, 20 cm in front of a convex mirror which has, a focal length of 20 cm. Where is the image, likely to form?, (a) At a distance of 10 cm in front of the, mirror, (b) At focus in front of the mirror, (c) At a distance of 10 cm behind the, mirror, (d) At focus behind the mirror, Sol : www.cbse.site/sc/gm314, , 256. Sunil conducts an activity using an object, of height 10 cm and a convex mirror of, focal length 20 cm. He placed the object at, a distance of 20 cm in front of the mirror., What is likely to be height of the image, produced?, (a) 15 cm, (b) 5 cm, (c) 1 cm, (d) 20 cm, Sol : www.cbse.site/sc/gm314, , 257. A concave mirror forms image of an object, thrice in its size on a screen. Magnification, of a mirror gives information about the size, of the image relative to the object. It is, defined as the ratio of size of image to the, , Chap 6, , size of object. It is represented by m ., Size of image, m =, Size of object, Sign of magnification by mirror gives the, information about the nature of the image, produce by it., If the object x distance from the pole of, mirror. The distance of image from the, pole is:, (a) 2x, (b) 3x, (c) - 2x, (d) - 3d, Sol : www.cbse.site/sc/gm315,
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Direction For Questions, (255-256), A concave lens is thick at the edges and, thin at the centre, while a convex lens is, thick at the centre and thin at the edges., We can distinguish between a concave lens, and a convex lens without touching them., For this keep a book close to a lens and, observe the image of the text of the book, through the lens. If the letters appear, enlarged, then it is a convex lens and if, the letters appear diminished then it is a, concave lens., Convex lens converges light rays and hence, known, as converging lens. Similarly,, concave lens diverges light rays and is known, as diverging lens. Linear magnification, produced by a lens is equal to the ratio of, the image distance to the object distance., Power of a lens is defined as the reciprocal, of its focal length., 258. If magnification produced by a spherical, lens is +0.75, then the nature of the lens is:, (a) Concave, (b) Convex, (c) Planoconvex, (d) None of these, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 209, , Sol : www.cbse.site/sc/gm316, , 259. If the focal length of the convex lens is, 80 cm . The power of the lens will be, (a) 1.25 D, (b) 2.25 D, (c) 1.90 D, (d) 2.90 D, Sol : www.cbse.site/sc/gm316, , refractive index 1.009. The speed of light in, vacuum is 3 # 108 ms-1 . The speed of light, in the glass is:, (a) 2 # 108 ms-1, (b) 3 # 108 ms-1, (c) 4 # 108 ms-1, (d) 9 # 108 ms-1, Sol : www.cbse.site/sc/gm317,
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******, , Don’t Take Printout of This File because, this is not useful. You can purchase hard, book from Amazon. Hard book includes, explanation of all MCQs in print form., , 260. When light ray goes from one transparent, medium to another transparent medium, it, suffers a change in direction, into second, medium. The extent of the change in, direction suffered by the phenomenon of, change in the path of light rays when going, from one medium to another medium is, known as refraction. Ray is a given pair, of media can be expressed in terms of, refractive index. The refractive index is, related to an important physical quantity, in the relative speed of light in different, media., , Light enters from air to glass having, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 210, , Reflection and Refraction, , Chap 6, ,

SELF ASSESSMENT TES, 1., , 2., , 3., , The power of a concave lens of focal length, of 2 m is(a) 0.5 D, (b) - 0.5 D, (c) 1 D, (d) - 1 D, No matter how far you stand from a mirror,, your image appears erect. The mirror is, likely to be(a) Plane, (b) Concave, (c) Convex, (d) Either plane or convex, An object of size 7.0 cm is placed at 27 cm, in front of a concave mirror of focal length, 18 cm. At what distance from the mirror, should a screen be placed, so that a sharp, focussed image can be obtained?, (a) 54 cm, (b) 60 cm, (c) - 54 cm, (d) - 60 cm, , 4., , The speed of light in a transparent medium, is 0.6 times that of its speed in vacuum., The refractive index of the medium is:, (a) 1.66, (b) 1.96, (c) 1.26, (d) 1.29, , 5., , With respect to air, the refractive index of, ice is 1.31 and that of rock salt is 1.54. the, refractive index of rock salt with respect to, ice is(a) 1.25, , (b) 1.18, (c) 1.90, (d) 1.40, 6., , A convex lens of focal length 25 cm and, a concave lens of focal length 10 cm are, placed in close contact with each other., The power of this combination is(a) 2 D, (b) 6 D, (c) - 6 D, (d) 9 D, , 7., , A student wants to project the image of, a candle flame on a screen 80 cm in front, of a mirror by keeping the candle flame, at a distance of 20 cm from its pole. The, magnification of the image produced is(a) - 4, (b) - 2, (c) - 6, (d) - 1, , 8., , The image of a candle flame placed at a, distance of 30 cm from a spherical lens is, formed on a screen placed on the other side, of the lens at distance of 60 cm from the, optical centre of the lens. The focal length, of lens is(a) 40 cm, (b) 30 cm, (c) 50 cm, (d) 20 cm, , 9., , Which of the following are correctly, matched for the concave mirror?, Object, , Image, , 1. Between P and F at infinity, 2. At C, , at C, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 211, , 3. Beyond C, , between F and C, , 4. At infinity, , at focus, , Choose the correct option from the codes, given below :, (a) 1, 3, 4, (b) 2, 3, 4, (c) 1, 2, 3, (d) 1, 2, 3, 4, 10. The, (a), (b), (c), (d), , laws of reflection hold good for:, plane mirror only, concave mirror only, convex mirror only, All mirrors irrespective of their shape., , 11. A child standing in front of a magic mirror., She finds the image of her head bigger, the, middle portion of her body of the same size, and that of the legs smaller. The following, is the order of combinations for the magic, mirror from the top., (a) Plane, convex and concave, (b) Convex, concave and plane, (c) Concave, plane and convex, (d) Convex, plane and concave, 12. Which of the following correctly represents, graphical relation between angle of, incidence (i) and angle of reflection (r)?, , 13. All of the following statements are correct, except, (a) The magnification produced by a, convex mirror is always less than one, (b) A virtual, erect, same-sized image can, be obtained using a plane mirror, (c) A virtual, erect, magnified image can, be formed using a concave mirror, (d) A real inverted, same-sized image can, be formed using a convex mirror, 14. The, (a), (b), (c), (d), , field of view is maximum for, Plane mirror, Concave mirror, Convex mirror, Cylindrical mirror, , 15. The ratio of the refractive index of red light, to blue light in air is(a) Less than unity, (b) Equal to unity, (c) Greater than unity, (d) Less as well as greater than unity, depending upon the experimental, arrangement, 16. An object is immersed in a fluid. In order, that the object becomes invisible, it should, (a) Behave as a perfect reflector, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 212, , Reflection and Refraction, , (b) Absorb all light falling on it, (c) Have refractive index one, (d) Have refractive index exactly matching, with that of the surrounding fluid, 17. Choose the correct relation between u , v, and R for spherical mirrors., (a) R = 2uv, u+v, (b) R =, (c), , R=, , 2, u+v, , can, (a), (b), (c), (d), , Chap 6, , definitely be seen by using, a concave mirror, a convex mirror, a plane mirror, both concave as well as plane mirror, , 22. Which of the following figures shows, refraction of light while going from denser, to rarer medium?, , 2 (u + v), (uv), , (d) None of these, 18. A spherical mirror and a thin spherical lens, each has a focal length of - 15 cm . The, mirror and the lens are likely to be(a) Both concave, (b) Both convex, (c) The mirror is concave and lens is, convex, (d) The mirror is convex, but the lens is, concave, 19. The inner shining surface of a steel spoon, serves as a, (a) Plane mirror, (b) Concave mirror, (c) Convex mirror, (d) Any one of the above, 20. A ray of light falls on a plane mirror making, an angle of 30c with normal. On deviation,, the ray of light deviates through an angle, of, (a) 120c, (b) 140c, (c) 160c, (d) 180c, 21. A full length image of a distant tall building, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 213, , 23. The focal length of a combination of convex, lens of power 1 D and concave lens of power, - 1.5 D is(a) - 2 m, (b) 2 m, (c) 2.5 m, (d) 0.5 m, , of the angles of incidence and the angle, of emergence by following the labelling, indicated in figure., , 24. Which of the following graphs shows, correct variation between the power (P) of, a converging lens and its focal length (f )?, , 25. A student does the experiment on tracing, the path of a ray of light passing through, a rectangular glass slab for different angles, of incidence. He can get a correct measure, , 26. Which of the following can make a parallel, beam of light when light from a point, source is incident on it?, (a) Concave mirror as well as convex lens., (b) Convex mirror as well as concave lens., (c) Two plane mirrors placed at 90c to, each other., (d) Concave mirror as well as concave, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 214, , Reflection and Refraction, , lens., 27. A beam of light is incident through the, holes on side A and emerges out of the, holes on the other face of the box as shown, in figure. Which of the following could be, inside the box?, , (a), (b), (c), (d), , Concave lens, Rectangular glass slab, Prism, Convex lens, , 28. Given a point source of light, which of the, following can produce a parallel beam of, light?, (a) Convex mirror, (b) Concave mirror, (c) Concave lens, (d) Two plane mirrors inclined at an angle, of 90c, 29. What is the power of a concave lens whose, focal length is - 75.0 cm ?, (a) 1.33 D, (b) - 13.3 D, (c) 13.3 D, (d) - 1.33 D, 30. When sun rays are focussed with a convex, lens, a sharp, bright spot is observed at its, focus. What does this spot indicate?, (a) The real image of the sun., , Chap 6, , (b) The virtual image of the sun., (c) An optical illusion produced by the, convex lens., (d) The magnified image of the sun., 31. SI unit of power of a lens is, (a) joule, (b) dioptre, (c) candela, (d) watt, 32. A beam of light composed of red and green, rays is incident obliquely at a point on, the face of a rectangular glass slab. When, coming out on the opposite parallel face,, the red and green rays emerge from, (a) one point propagating in the same, direction., (b) one point propagating in two different, directions., (c) two points propagating in two different, parallel directions., (d) two points propagating in two different, non-parallel directions., 33. A man runs towards a mirror with a speed, of 15 m - s-1 . What is the speed of his, image ?, (a) 7.5 m - s-1, (b) 15 m - s-1, (c) 30 m - s-1, (d) 45 m - s-1, 34. An object is placed at a distance f in the, front of a convex mirror. If focal length, of the mirror is f , then distance of image, from pole of the mirror is, (a) f, (b) 2f, f, (c), 2, f, (d), 4, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 215, , 35. The projection lens of a projector has focal, length 5 cm. It is desired to get an image, with a magnification 30. The distance of, the screen from the lens must be, (a) 0.3 m, (b) 0.8 m, (c) 1.55 m, (d) 2.55 m, 36. Which of the following ray diagrams is, correct for the ray of light incident on a, lens shown in figure., , 37. A point source of light P is placed at a, distance L in front of a mirror of width d, hung vertically on a wall. A man walks in, front of the mirror along a line parallel to, the mirror at a distance 2L as shown in the, figure. The greatest distance over which he, can see the image of the light source, in the, mirror, is, , Choices are given in figure., , d, 2, (b) d, (c) 2d, (d) 3d, (a), , 38. A combination of a concave and convex, lens has power 5 D . If the power of convex, lens is 4 D , then focal length of the concave, lens is, (a) 10 cm, (b) 20 cm, (c) 100 cm, (d) 200 cm, 39. An object is placed 20 cm from the concave, mirror of focal length 10 cm, then image is, formed at, (a) centre of curvature of mirror, , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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For Answer and Explanation Question Click the Link in Pink Color., Page 216, , Reflection and Refraction, , (b) behind the mirror, (c) between the mirror and focus, (d) at focus, 40. Light rays A and B fall on optical, component X and come out as C and D ., , The, (a), (b), (c), (d), , optical component is a, concave lens, convex lens, convex mirror, prism, , 41. Assertion : When light travels from one, medium to another. The direction of, propagation of light in second medium, changes., Reason : Light travels with different speeds, in different mediums., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., 42. Assertion : Power of a convex lens is positive, and that of a concave lens is negative., Reason : Convex lens forms real image and, concave lens forms virtual image., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., , Chap 6, , (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., 43. Assertion : The twinkling of star is due to, reflection of light., Reason : The velocity of light changes while, going from one medium to the other., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., 44. Assertion : A ray incident along normal to, the mirror retraces its path., Reason : In reflection, angle of incidence is, not equal to angle of reflection., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Both Assertion and Reason are false., 45. Assertion : The mirror used in search lights, are concave spherical., Reason : In concave spherical mirror the, image formed is always virtual., (a) Both Assertion and Reason are true, and Reason is the correct explanation, of Assertion., (b) Both Assertion and Reason are, true but Reason is not the correct, explanation of Assertion., (c) Assertion is true but Reason is false., (d) Assertion is false but reason is true.,
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Direction For Questions, (46-50), , To Purchase Hard Book of From Amazon Click Here., For More Details Whatsapp at 8905629969

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This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question., Chap 6, , Reflection and Refraction Page 217, , Many optical instrument (like compound, microscope) having number of lenses which, are arranged is same specific manner, and it is increases the magnification and, sharpness of image which is formed by, optical instrument. The net power (P ) of, the lenses placed in contact is given by, the algebraic sum of the individual powers, P1, P2, P3, ..... as, P = P1 + P2 + P3 + ....., The use of powers, instead of focal lengths,, for lenses is quite convenient for opticians, During eye-testing, an optician puts several, different combinations of corrective lenses, of known power, in contact, inside the, testing spectacles frame. The optician, calculates the power of the lens required by, simple algebraic addition. For example, a, combination of two lenses of power + 2.0 D, and + 0.25 D is equivalent to a single lens, of power + 2.25 D . The simple additive, property of the powers of lenses can be used, to design lens systems to minimise certain, defects in images produced by a single lens., Such a lens system, consisting of several, lenses, in contact, is commonly used in the, design of camera lenses and the objectives, of microscopes and telescopes., 46. The power of a convex lens is 4.0 D. The, focal length of this lens will be:, (a) 0.5 m, (b) 0.25 m, (c) 2.5 m, (d) 5 m, 47. Two lenses of power 12 D and - 0.3 D are, in contact to each other. Their combined, power will be:, (a) + 0.2 D, (b) - 0.2 D, (c) + 0.5 D, (d) + 0.8 D, , 48. Which of the following instrument consists, of a lens system consisting of two or more, lenses in contact?, (a) Microscope, (b) Telescope, (c) Camera, (d) All of the above, 49. The focal lengths of two lenses in contact to, each other are 20 cm and 50 cm respectively., Their combined power is:, (a) + 7.0 D, (b) + 70 D, (c) + 3.0 D, (d) + 30 D, 50. In many optical instruments, the lenses are, combined due to the following reason:, (a) to increase the magnification of the, image, (b) to increase sharpness of the image, (c) to get virtual images of the object, (d) Both (a) and (b), Ke, ,

Answer, 1., , 2., , 3., , 4., , 5., , 6., , 7., , 8., , 9., , 10., , (b), , (d), , (c), , (b), , (b), , (c), , (a), , (d), , (b), , (d), , 11., , 12., , 13., , 14., , 15., , 16., , 17., , 18., , 19., , 20., , (c), , (d), , (d), , (c), , (a), , (d), , (a), , (a), , (b), , (a), , 21., , 22., , 23., , 24., , 25., , 26., , 27., , 28., , 29., , 30., , (b), , (b), , (a), , (b), , (d), , (a), , (d), , (b), , (d), , (a), , 31., , 32., , 33., , 34., , 35., , 36., , 37., , 38., , 39., , 40., , (b), , (c), , (b), , (c), , (c), , (a), , (d), , (c), , (a), , (a), , 41., , 42., , 43., , 44., , 45., , 46., , 47., , 48., , 49., , 50., , (a), , (c), , (d), , (c), , (c), , (b), , (a), , (d), , (a), , (d), ,
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