A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror.

Monjur Alahi

A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror. The angle of incidence is 60° and the number of photons striking the mirror per second is 1.0 x 1019 . Calculate the force exerted by the light beam on the mirror.


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Salim Ahmed Kawsar

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λ  = 663 x 10–9 m,  θ= 60°, n = 1 x 1019, λ = h/p

=> P = p/λ = 10–27

Force exerted on the wall = n(mv cosθ –(–mv cosθ)) = 2n mv cos θ.

= 2 x 1 x 1019 x 10–27 x ½ = 1 x 10–8 N.

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