Question 1 :
Four students perform an experiment on tracing the path of a ray of light passing through a rectangular glass slab. Their individual observations are:<br>identify the incorrect observation and correct them.<br>
Question 2 :
State whether given statement is True or False<br/>A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.<br/>
Question 4 :
A concave lens forms the image of an object which is :<br><br>
Question 5 :
State whether true or false.<br/>A convex mirror always forms a real image.
Question 6 :
Which of the following mirrors forms an image which is virtual and smaller in size?
Question 7 :
When a ray of light passes through a rectangular slab, made up of some transparent material other than glass, the emergent ray is
Question 8 :
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed are two position of the lens to form real images. If the heights of the images are $$4\ cm$$ and $$9\ cm$$ respectively the height of the object is
Question 9 :
Which of the following term is not associated with a lens ?
Question 12 :
A convex lens makes a real image $$4\ cm$$ long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is $$16\ cm$$ tall. The length of the object must be
Question 13 :
The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is:-
Question 14 :
Which of the following is not a use of concave lens?
Question 15 :
A ray passing with which part of a lens emerges undeviated ?
Question 16 :
State whether true or false.<br/>The images formed by a convex mirror are always erect and enlarged.
Question 17 :
Choose the correct answer:<br>The nature of image formed by convex mirror is:
Question 18 :
State whether the following statement is True or False. <br/>The image formed by a convex lens is real diminished and erect.
Question 19 :
A spherical mirror and a thin spherical lens have each a focal length of $$-15$$ cm. The mirror and lens are likely to be :<br/>
Question 20 :
A convex mirror used for rear view on an automobile has a radius of curvature of 3.00m. If a bus is located at 5.00m from this mirror, find magnification?<br>
Question 23 :
A unit vector along the incident ray of light is $$\hat{i}$$. The unit vector for the corresponding refracted ray of light is $$\hat{r}\cdot \hat{n}$$, a unit vector normal to the boundary of the medium and directed towards the incident medium. If $$\mu$$ is the refractive index of the medium, then Snell's law (second law) of refraction is :
Question 24 :
Fill in the blank. A _____ is a piece of transparent glass bounded by two spherical surfaces. 
Question 27 :
The mirror which always produces an erect and virtual image of a real object is:<br/>
Question 29 :
The distance between an object and its real image produced by a converging lens is $$0.72\ m$$. The magnification is $$2$$. What will be the magnification when the object is moved by $$0.04\ m$$ towards the lens?
Question 30 :
In order to get a diminished virtual image, the object can be placed anywhere in front of a :
Question 32 :
The relation between the linear magnification $$m,$$ the object distance $$u$$ and the focal length $$f$$ is
Question 34 :
The focal length of a concave lens is $$2m$$. Then the power of the lens is:<br/>
Question 35 :
A man sees a smallstationary fish deep in a very clear lake and shoots it accurately. He will
Question 36 :
The radius curvature for a convex lens is $$40\ cm$$, for each surface. Its refractive index is $$1.5$$. The local length will be
Question 37 :
If a $$3cm$$ tall object placed perpendicular to principal axis of a convex lens of focal length $$15cm$$ produces a real invented image of height $$15cm$$, then its object distance $$(u)$$ is ................ and image distance $$(v)$$ is ................
Question 38 :
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of :
Question 39 :
Which of the following is not a characteristic of image formed by Concave lens ?
Question 40 :
The magnification of an image by a convex lens is positive only when the project is placed:
Question 41 :
What type of mirror can be used alone to obtain a real image of a real object?
Question 43 :
State the direction of incident ray which after reflection from a spherical mirror retraces its path:
Question 44 :
A real and enlarged image can be obtained by using a:
Question 45 :
State whether true or false:A concave lens forms a magnified or diminished image depending on the distance of object from it.<br/>
Question 46 :
The ratio of the sine of angle  of incidence to the sine of angle of refraction is a constant for :
Question 47 :
On the basis of their experiment, "To trace the path of a ray of light through a rectangular glass slab," students of a class arrived at which one of the following conclusions :
Question 49 :
Due to refraction, when seen from outside,a coin placed under water in a bowl, appears to
Question 52 :
A convex and a concave lens separated by distance $$d$$ are then put in contact. The focal length of the combination
Question 53 :
The radius of curvature of a plano-convex lens  is 20 cm If the refractive index of the material of the lens be 1.5 it will
Question 54 :
A beam of light passes through a sheet of plastic and out into the air. The beam makes $${\theta}_{1}$$ angles with the normal as it passes through the plastic and the angle the beam of light makes with the normal as it passes into the air is $${\theta}_{2}$$. The refractive index for air is $$1$$ and The refractive index for plastic is $$2$$.<br/>Calculate the value of $$\sin{{\theta}_{2}}$$, in terms of $${\theta}_{1}$$?
Question 56 :
When an object is moved along the principal axis of a thin converging lens of focal length 12 cm, two images, three times the size of the object are obtained when the object is at $$x_1$$ and $$x_2$$ distance from the lens. Which one of the following could be the value of the ratio $$\frac {x_1}{x_2}$$ ?
Question 57 :
A beam of light converges towards a point O, behind a convex mirror of focal length 20 cm. Find the magnification and nature of the image when point O is 30 cm behind the mirror.
Question 58 :
The magnifications produced by a convex lens for two different of an object are $$m_1$$ and $$m_2$$ respectively $$(m_1 >m_2)$$. If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is
Question 59 :
A ray of light strikes a glass plate at an angle of $${60}^{o}$$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is
Question 60 :
Light of frequency $$\nu$$, wave length $$ \lambda $$ travelling with a velocity $$v$$ enters into a glass slab of refractive index $$ \mu $$ then frequency, wave length and velocity of the wave in glass slab respectively are :<br/>
Question 61 :
An object is placed at 20 cm in front of a concave mirror produces three times magnified real image. What is focal length of the concave mirror?
Question 62 :
An object is placed on the principal axis of a concave mirror at a distance of 60 cm. If thefocal length of the concave mirror is 40 cm then determine the magnification of the obtainedimage.
Question 63 :
A ray of light falls on a transparent glass slab of refractive index $$1.62$$. What is the angle of incidence, if the reflected ray and reflected ray are mutually perpendicular ?
Question 65 :
Find out the correct option from the following.<br>(a) The magnification is positive for all virtual images and is negative for all real images.<br>(b) The magnification of concave lens and convex mirror is always positive where as the magnification of convex lens and concave mirror can be positive or negative depending on the position of the object before the lens.<br>
Question 66 :
A convex lens of focal length $$84\ cm$$ is in contact with a concave lens of focal length $$12\ cm$$. The power of combination (in diopters) is
Question 67 :
An object is placed at a distance of $$f/2$$ from a convex lens. The image will be
Question 68 :
A light ray passes from a material of low refractive index to one of high refractive index. Which of the pairs of quantities listed below describes the light ray as it strikes and passes through the interface between the two materials? Match the descriptions below with the statement that <i>best</i> describes the situation.<br/>A part of the light ray remains inside the low refractive index material:<br/>
Question 69 :
A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is $$ 1.39 \times 10^9 m$$ and its mean distance from the earth is $$1.5 \times 10^{11} \ m$$, the diameter of the sun's image on the paper is 
Question 70 :
The angle between reflected and refracted beams is $$90^0$$in the water air interface. The angle of incidence in water is
Question 71 :
The distance between an object and the screen is $$100$$cm. A lens produces an image on the screen when placed at either of two positions $$40$$cm apart. The power of the lens is approximately.
Question 72 :
A point on the principal axis of a lens, to which light rays parallel to the principal axis converge after passing through the lens, is ............
Question 73 :
A double concave thin lens made out of glass ($$\mu = 1.5 $$) have radii of curvature 500 cm. This lens is used to rectify the defect in vision of a person. The far point of the person will be at
Question 74 :
A glass slab has two long parallel faces. Light ray is incident on the glass slab and trace of light ray is drawn. Now glass slab is shifted parallel to the parallel faces. What will be the effect on the trace of light?
Question 75 :
Identify the power of the lens in increasing order for the following cases<br/>1) lens of focal length 10 cm<br/>2) lens of focal length 10 m<br/>3) lens of focal length 2 m<br/>4) lens of focal length 50 m
Question 76 : After tracing the path of a ray of light passing through a rectangularglass slab for four different values of the angle of incidence, a studentreported his observations in tabular form as given below :<br><table class="wysiwyg-table"><tbody><tr><td><br>S.No</td><td><i</td><td><r</td><td>< e</td></tr><tr><td><br>I</td><td>$${30^0}$$</td><td>$${19^0}$$</td><td>$${29^0}$$<br></td></tr><tr><td>II</td><td>$${40^0}$$</td><td>$${28^0}$$</td><td>$${40^0}$$</td></tr><tr><td>III</td><td>$${50^0}$$</td><td>$${36^0}$$</td><td>$${50^0}$$</td></tr><tr><td>IV</td><td>$${60^0}$$</td><td>$${40^0}$$</td><td>$${59^0}$$</td></tr></tbody></table>The best observation is :
Question 77 :
A plano-convex lens of refractive index $$1.5$$ and radius of curvature $$30\ cm$$ is silvered at the curved surface. Now this lens has to be formed to form the image of an object. At what distance from this lens, an object is to be placed in order to have a real image of the size of the object?
Question 79 :
What does the sign of magnification indicates $$\left (m = \dfrac {-v}{u}\right )$$?<br/>a) Negative sign indicates image is real and inverted.<br/>b) Positive sign indicates image is erect and virtual.<br/>c) Positive sign indicates image is virtual.
Question 80 :
The least distance of vision of a longsighted person is $$60\ cm$$. By using a spectacle lens, this distance is reduced to $$12\ cm$$. The power of the lens is
Question 82 :
For the same angle of incidence, the angles of refraction in media P, Q, R and S are $$50^o, 40^o, 30^o, 20^o$$, respectively. The speed of light is minimum in medium :<br/>
Question 83 :
A concave mirror produces $$10$$ times enlarged image (real) of an object placed $$1 cm$$ in front of it. Where is the image located?
Question 84 :
White light is incident normally on a glass slab. Inside the glass slab,
Question 85 :
A object is placed at 30 cm on the principle axis of the convex lens from the lens and an image is formed 60 cm from the lens. If focal length of the lens is 20 cm then calculate the magnification.
Question 86 :
When a ray of light traveling from vacuum to a medium of refractive index $$\mu $$, the angle of incidence is twice the angle of refraction. The incident angle is :<br/>
Question 87 :
An object of length $$6\ cm$$ is placed on the principle axis of a concave mirror of focal length $$f$$ at a distance of $$4\ f$$. The length of the image will be
Question 88 :
The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by $$'m'$$. Then $$m$$ is equal to (symbols have their usual meanings)
Question 89 :
When light ray bends away from normal then which angle is larger?<br>
Question 90 :
A ray of light travelling inside a rectangular glass block of refractive index $$\sqrt 2$$ is incident on the glass-air interface at an angle of incidence of $$45^o$$. The refractive index of air is one. Under the these conditions the ray will
Question 91 :
The image of an object placed in front of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distant from the mirror than the object. The magnification of the image is:<br/>
Question 92 :
The apparent flattening of the sun at sunset and sunrise is due to
Question 93 :
The sun subtends an angle of $$(1/2)^o$$ at earth.The image of the sun is obtained on a screen using a converging lens of focal length 1.5 cm.The diameter of the image will be :
Question 94 :
The resolving power of an astronomical telescope is $$0.2$$ seconds. If the central half portion of the objective lens is covered, the resolving power will be:-
Question 95 :
A ray of light moving along the unit vector $$\dfrac{1}{\sqrt5}(\hat { -i  } -2\hat { j } )$$ undergoes refraction at an interface of two media, which is the x-z plane. The refractive index for y > 0 is 2 while for y < 0, it is $$\sqrt{5}$$/2. The unit vector along which the refracted ray moves is
Question 96 :
A ray of light is incident from one medium $$(\mu = 1.5)$$ into another medium. If the angle of incidence and refraction are, respectively,$$60$$and$$45$$, thenwhatwill be the refractive index of the denser medium?
Question 97 :
If two $$+5D$$ lenses are mounted at some distance apart, the equivalent power will always be negative if the distance is
Question 98 :
Convex lens forms a real, point sized image at focus, the object is placed
Question 99 :
An object placed at a distance of <b>16 cm</b> from first principal focus of convex lens, produces a real image at a distance of <b>36 cm </b>from its second principal focus. Then the focal length of the lens is :
Question 101 :
The focal length of a thin biconvex lens is 20 cm. when an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes from $$m_{25}$$ to $$m_{50}$$. The ratio of $$m_{25}$$ to $$m_{50}$$ is :
Question 102 :
A water film is formed on a glass-block. A light ray is incident on water film from air at an angle of$$\displaystyle { 60 }^{ \circ }$$ with the normal. The angle of incidence on glass slab is<br>($$\displaystyle { \mu }_{ g } = 1.5,{ \mu }_{ w } = \frac { 4 }{ 3 }$$)
Question 103 :
A short linear object of length $$b$$ lies along the axis of a concave mirror of focal length $$f$$ at a distance u from the pole of the mirror. The size of the image is approximately equal to :<br>
Question 104 :
The distance between an object and its doubly magnified image by a concave mirror is: [ Assume $$f$$ = focal length]
Question 105 :
The diameter of the reflecting surface of spherical mirror is called ..............
Question 106 :
The angle between the incident ray and the normal is called ________.<br>
Question 107 :
A small object of linear dimension $$x$$ lies on the axis of an optical mirror of local length $$f$$ at a distance $$a$$ from mirror. The linear dimension of image:
Question 108 :
A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4 D, the power of a divided lens will be
Question 109 :
An image of a bright square is obtained on a screen with the aid of a convergent lens. The distance between the square and the lens is $$40\ cm$$. The area of the image is nine times larger than that of the square. Select the correct statement(s).
Question 110 :
Image of an object at infinity is formed by a convex lens of focal length $$30 \ cm$$ such that the size of the image is $$2 \ cm$$. If a concave lens of focal length $$20\  cm$$ is placed in between the convex lens and the image, at a distance $$26\  cm$$ from the convex lens, size of the new image is:
Question 111 :
The magnitude of focal length of a concave mirror is $$f$$. An object is placed at a distance $$x$$ from the focus and forms a real image. The magnification is:<br/>
Question 112 :
Air has refractive index $$1.0003$$. Find the thickness of air column which will contain one more wavelength of yellow light of $$6000$$ $$A^0$$ than in same thickness of vacuum.
Question 113 :
When a light of wavelength $$4000$$ $$\displaystyle \overset { \circ  }{ A } $$ in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is $$200$$. Find the thickness, if refractive indices of diamond and water are $$\displaystyle \frac { 5 }{ 2 } $$ and $$\displaystyle \frac { 4 }{ 3 } $$ respectively.
Question 114 :
A point object is placed on the principal axis of the convex lens of focal length 20cm at a distance 40 cm to the left on it. The diameter of the lens is 10cm. If the eye is placed 60cm to the right of the lens at a distance h below the principal axis, then max value of 'h' to see the image is
Question 115 :
A spherical convex surface separates object and image space of refractive index $$1$$ and $$4/3$$ respectively. If radius of curvature of the surface s $$0.1\ m$$, its power is
Question 116 :
A $$4.5 cm$$ needle is placed $$12 cm$$ away from a convex mirror of focal length $$15 cm$$. Find the location of the image and the magnification.
Question 118 :
What happens when a ray of light is made to fall on a mirror along the normal?<br/>
Question 119 :
Three convex lenses are available having focal lengths of $$4 cm, 40 cm$$ and $$4 m$$ respectively. Which one could be used as magnifying glass?
Question 120 :
A short linear object of length $$b$$ lies along the axis of a concave mirror of focal length $$f$$ at a distance $$u$$ from the pole of the mirror. The size of the image is approximately equal to:<br/>
Question 121 :
Aconvex lens of radii of curvature 20 cm and 30 cm respectively. It is silveredat the surface which has smaller radius of curvature. Then it will behave as $$(\mu_g\, = \, 1.5)$$
Question 122 :
The reflecting surface is given by $$y = \dfrac{10L}{\pi} \sin \dfrac{\pi x}{5L}$$. The co-ordinates of the point where a horizontal ray becomes vertical after reflection is:
Question 123 : In the table below, column I lists various mirrors  and lenses and column II their uses, qualities or properties.<br/><table class="wysiwyg-table"><tbody><tr><td>column  I</td><td>Column II</td></tr><tr><td>I. Plane mirror</td><td>A. Feels thinner in the middle.</td></tr><tr><td>II. Concave mirror</td><td>B. Always forms virtual image.</td></tr><tr><td>III. Convex mirror</td><td>C. Always forms virtual image of smaller size.</td></tr><tr><td>IV. Concave lens </td><td>D. Is used by dentists to examine teeth.</td></tr><tr><td>V. Convex lens</td><td>E. Can be used as reading glass.<br/></td></tr></tbody></table>The correct matching is:
Question 124 :
The final image in an astronomical telescope is _______ the original object . Fill in the gap.<br/>
Question 125 :
A concave shaving mirror has a radius of curvature of 35.0 cm. It is positioned so that the (upright) image of a mans face is 2.50 times the size of the face. How far is the mirror from the face?
Question 126 :
Two thin lenses of power $$+3.5D, -2D$$ are placed in contact. Find the power of lens combination.
Question 127 :
An object is placed at $$30$$ cm distance from a concave mirror of focal length $$20$$ cm, then nature, magnification of the image will be:
Question 128 :
The image obtained while finding the focal length of convex lens is...................
Question 129 :
In vacuum, to travel distance 'd', light takes time 't' and in medium to travel distance $$'5d'$$, it takes time 'T'. The critical angle of the medium is.<br>
Question 130 :
Let the x-z plane be the boundary between two transparent media. Medium $$1$$ in $$z\ge 0$$ has a refractive index of $$\sqrt { 2 } $$ and medium $$2$$ with $$z< 0$$ has refractive index of $$\sqrt { 3 } $$. A ray of light in medium $$1$$ given by the vector $$\vec { A } =6\sqrt { 3 } \hat { i } +8\sqrt { 3 } \hat { j } -10\hat { k } $$ is incident on the plane of separation. The angle of refraction in medium $$2$$ is:
Question 131 :
A flim projector magnifies a flim of area $$100 $$ square centimeter on screen. If linear magnification is $$4$$ then area of magnified image on screen will be-
Question 132 :
A $$2.5$$ dioptre lens forms a virtual image which is $$4$$ times the object placed perpendicularly on the lens. Then the required distance of the object from the lens is .
Question 133 :
The glancing angle of incidence is $$10^{\circ}$$. What will be the glancing angle of reflection?
Question 134 :
A ray of light going towards the centre of curvature of a convex mirror ............
