Question

An object is placed at away from first focus of a convex lens where is the focal length of the lens. Its image is formed at a distance in a slab of refractive index , from the face of the slab facing the lens. Find the distance of this face of the slab from the second focus of the lens.

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A

B

C

D

Hard
Solution
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Correct option is D)

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image is formed at a distance from the face i.e, in air it is a distance from the face

so the distance between second focus and the face is
option is correct 

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