Physics-
General
Easy
Question
A plane mirror M is arranged parallel to a wall W at a distace 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 
towards the wall. Then
- 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 became larger and shift away from the source with speed larger than V
- The size of the light spot continuously decreases but does not shift
The correct answer is: The spot of light will not move on the wall and spot has no increase in size
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