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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

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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
image
A. directly proportinal to x
B. constant but not zero
C. inversely proportional to x
D. zero
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Correct Answer - D
image
AB=PB-PA=2(a+L)-2a
=2L= constant.
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