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Question

A light of wavelength 650 nm falls on a surface at an angle 60 and bounces back at the same angle from the normal. If the reflectivity of the surface is 50 % and intensity of light is 100 W/m2, find the pressure experienced by the surface due to the reflected radiation.

A
1.67×107 N/m2
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B
1.67×105 N/m2
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C
1.67×109 N/m2
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D
1.67×102 N/m2
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Solution

The correct option is A 1.67×107 N/m2
λ=650 nm
θ=60
r=50%=0.5
I=100 W/m2

Pressure experienced by the surface is,

P=FA=(2pcosθ)A

As, p=Ec=IAc

P=0.5×Ic×2cosθ

=0.5×1003×108×2×cos60

=1.67×107 N/m2

Hence, (A) is the correct answer.

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