A plane mirror is falling vertically as ...

A plane mirror is falling vertically as ssshown in the figure. If S is a point source of light, the rate of increase of the length AB is

directly proportinal to x

constant but not zero

inversely proportional to x

zero

Text Solution

Verified by Experts

The correct Answer is:

AB=PB-PA=2(a+L)-2a
=2L= constant.

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