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CSE · Paper I · Waves & Opticscse-2025-subject-02-002

Light beam — UPSC Physics Optional CSE 2025 Paper I

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A light beam of wavelength 600\text{ nm} produced by a 20\text{ mW} laser source is incident on a plane mirror. Determine : (i) number of photons per second striking the surface of the mirror. (ii) force exerted by the light beam on the mirror.

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