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A beam of photons of light of wavelength, λ strike a surface at an angle of incidence θ Assuming all the incident photons (N photons per second) to get reflected back in a perfect elastic way, the force exerted, by the incident light beam, on the surface, is

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Best answer

Correct option :  (3)

Explanation :

The momentum of each photon, p = p = h/λ

Its change in momentum, after getting reflected back, is

Rate of change of momentum = Total change in momentum of all photons, incident on the surface, in one second

∴ Force exerted = Rate of change of momentum 

directed normally upwards 

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