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 patch of light on the wall. The mirroo moves with velocity v towards the wall.
Which of the following statement(s) is`//`are correct?

Options

A. The patch of light will move with speed v on the wall
B. The patch of light will not move on the wall
C. As the mirror comes closer, the patch of light will become larger and shift away from the wall with speed larger than v
D. The size of the patch of light on the wall remains the same

Answer

b.,d.

Explanation

From the above ray diagram, it is clear that the option (b) and (d) are correct.