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Q.

A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by appropriately placing

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a

A convex  lens of suitable focal length more than 0.25 m

b

A concave lens of suitable focal length

c

A convex mirror of suitable focal length

d

A convex lens of suitable focal length less than 0.25 m

answer is D.

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Detailed Solution

Convex mirror and concave lens do not form real image. For concave mirror

v > u, so image will be enlarged, hence only convex lens can be used for the purpose.

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