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In the figure shown a slab of refractive index 3/2 is moved at speed $1 m / s$ towards a stationary observer. A point ' P ' is observed by the observer with the help of paraxial rays through the slab. Both 'O ' and observer lie in air. The velocity with which the image will move is:

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2 m / s towards left

3 m / s towards left

Zero

4/3 m/s towards left

answer is D.

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Detailed Solution

Slab only shifts the image of point P by some distance which will remain constant and does not depend upon the location of slab so the final image formed by slab has a fixed separation from ‘O’ and will not move.

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