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Question

A beam of light of wavelength λ is incident on a mirror at an angle θ. Find the change in momentum of the photon after reflection.

A
2hλsinθ
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B
hλcosθ
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C
2hλcosθ
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D
none of these
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Solution

The correct option is B 2hλcosθ
After reflection the horizontal component of velocity remains same and normal component reverses its direction

ΔP=2Pcosθ

For photon P=hλ

ΔP=2hλcosθ


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