Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A small mirror of mass 
is suspended by a massless thread of length 
. Then the small angle through which the thread will be deflected when a short pulse of laser of energy E falls normal on the mirror
(c = speed of light in vacuum and 
acceleration due to gravity)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Force due to beam assuming complete reflection 
is power
So change in momentum of mirror.
Now using work energy theorem…. (i)
as 
is small
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