Physics-
General
Easy

Question

A flat mirror M is arranged parallel to a wall Wat a distance 1 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.

  1. The spot of light will move with the speed v on the wall.    
  2. The spot of light will move on the wall.    
  3. As the mirror comes closer the spot of light will became larger and shift away from the wall with speed larger then v.    
  4. The size of the light spot on the wall remains the same.    

The correct answer is: The size of the light spot on the wall remains the same.

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