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  • The mirror of length L moves horizontally as shown in the figure with a velocity v. The mirror is illuminated by a point source of light 'P' placed on the ground. The rate at which the leng

The mirror of length L moves horizontally as shown in the figure with a velocity v. The mirror is illuminated by a point source of light 'P' placed on the ground. The rate at which the length of the light spot on the ground increases is:

Option: 1

v


Option: 2

zero


Option: 3

2v


Option: 4

3v


Answers (1)

At any general time
Length of light spot \mathrm{=2(d+L)-2 d=2 L=} const.

Posted by

Kshitij

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