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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 
towards the wall.
- The spot of light will move with the speed on the wall.
- The spot of light will move on the wall.
- As the mirror comes closer the spot of light will became larger and shift away from the wall with speed larger then .
- The size of the light spot on the wall remains the same.
on the wall.
.
The correct answer is: The size of the light spot on the wall remains the same.
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