A flat mirror M is arranged parallel to the 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.

Question

A flat mirror M is arranged parallel to the 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., The spot of light will move with the speed v on the wall, The spot of light will move on the wall, As the mirror comes closer the spot of light will become larger and shift away from the wall with speed larger than v, The size of the light spot on the wall remains the same

MARKS App · Accepted Answer

​ Since for refraction ∠ i = ∠ r , so spot of light will not move on wall and will have same size of object

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