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Chapter - 15, Light, , Exercise Page No 189:, , Question 1:, Fill in the blanks:, (a) An image that cannot be obtained ona screen is called, , (b) Image formed by a convex, size., , , , is always virtual and smaller in, , , , (c) An image formed by a, that of the object., , (d) An image which can be obtained on a screen is called a, , image., , mirror is always of the same size as, , , , , , (e) An image formed by a concave, screen,, , cannot be obtained ona, , , , Answer:, , (a) An image that cannot be obtained on a screen is called _virtual, , Imaqe_., , A virtual image cannot be obtained ona screen. Only real images can be, obtained on a screen., , (b) Image formed by a convex _mirror_ is always virtual and smaller in, size., , A convex mirror forms a virtual, diminished and upright image of an, object., , (c) An image formed by a _plane__ mirror is always of the same size as, that of the object., , (d) An image which can be obtained on a screen is called a —teal_, image., , Only real images can be obtained ona screen., , (e) An image formed by a concave _lens__cannot be obtained ona, screen., , The image formed by concave lens is always virtual. A virtual image, cannot be obtained on a screen.
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Question 2:, Mark ‘T’ if the statement is true and ‘F’ i, , , , it is false:, (a) We can obtain an enlarged and erect image by a convex mirror. (T/F), (b) A concave lens always forms a virtual image. (T/F), , (c) We can obtain a real, enlarged and inverted image by a concave, mirror. (T/F), , (d) A real image cannot be obtained on a screen. (T/F), , (e) A concave mirror always forms a real image. (T/F), , Answer:, (a)False, , The image formed by a convex mirror is always virtual, diminished and, erect., , (b) True, , The image formed by a concave lens is always virtual, erect and, diminished., , (c) True, , The image formed by a concave mirror can be real or virtual, enlarged or, diminished, and erect or inverted, depending upon the distance of the, object from the mirror., , (d) False, , The image that can be obtained on a screen is called a real image., Virtual images cannot be obtained on a screen., , (e) False, , A concave mirror can form both real and virtual images. The nature of, the image depends on the distance of the object from the mirror.
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Q.3. Match the items given in Column | with one, or more items of Column II, , , , Column I, , Column IT, , , , (a) A plane mirror, (b) A convex mirror, , (QA convex lens, (da) A concave mirror, (e) A concave lens, , , , , , (), (i), , (iii), (iy, 7), , Used as a magnifying glass., , Can form image of objects spread over a large, area., , Used by dentists to see enlarged image of teeth., The image is always inverted and magnified., The image is erect and oj the same size as the, object., , , , , , , , (vi) The image is erect and smaller in size than the, object., Ans., Column I Column II, , (a) A plane mirror (y The image is erect and of the same size as, the object., , (b) A convex mirror (ii) Can form image of objects spread over a large, area., , (9 A convex lens (i) Used as a magnifying glass., , (d) A concave mirror | (iii) Used by dentists to see enlarged image of teeth., , (e) A concave lens (uv) The image is erect and smaller in, , , , , , size than the object.
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Q.4.State the characteristics of the image, formed by a plane mirror., , Ans.(i) Plane mirror forms an erect image., , (ii) It forms a virtual image., , (iii) Size of the image is same as that of the, object., , (iv)lmage is formed at the same distance behind, the mirror as the object stands in front of it., , (v) Image formed is a laterally inverted image i.e.,, right hand side of the object seems to be the left, hand side and vice-versa.
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Q.5.Find out the letters of English alphabet or any, other language known to you in which the image, formed in a plane mirror appears exactly like the, letter itself. Discuss your findings., , Ans.Letters like A, H, I, M, O, T, U,V, W etc. appear, same when seen through a plane mirror
