A beam of light of wavelength 
is totally reflected normal incidence by a plane mirror. The intensity of th light is such that photons hit the mirror at a rote 
. Give that the Planck constant is 
, the force exerted on th mirror by this beam is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let 
be the momentum of a photon arriving at the mirror, we then have 
The change in momentum for a photon
Force 
rate of change of momentum of the photons 
; where 
is the rate at which the photons hitting the mirror.
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