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A plane mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source ‘S’ kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity V towards the wall. Then

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The spot of light will move with speed V on the wall

The spot of light will not move on the wall and spot has no increase in size

As this mirror comes closer, the spot of light will become larger and shift away from the source with speed larger than V

The size of the light spot continuously decreases but does not shift

answer is B.

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Detailed Solution

As the mirror in a plane mirror object distance is equal to image distance and size of image doesn’t change.

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