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Light in certain cases may be considered as a stream of particles called photons. Each photon has a linear momentum h/λ where h is the Planck's constant and λ is the wavelength of light. A beam of light of wavelength λ is incident on a plane mirror at an angle of incidence θ. Calculate the change in the linear momentum of a photon as the beam is reflected by the mirror. |
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Answer» Thanks for ASKING the question! ANSWER:: P₁(incidence) = (h/λ) cos Ф i - (h/λ) sin Ф j P₂(REFLECTED) = -(h/λ) cos Ф i - (h/λ) sin Ф j Change in MOMENTUM will be in x-axis direction :: ΔP = (h/λ) cos Ф - [(h/λ) cos Ф] = (2h/λ) cos Ф Hope it helps! |
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