A beam of white light is incident normally on a plane surface absorbing 
of the light and reflecting the rest. If the incident beam of light is of power P, what will be the force exerted by it on the surface?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let E be the energy of the incident light of power P falling on surface for time t then.
Momentum of the incident light, 
Momentum of the reflected light, 
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