cse • paper_1 • waves_oscillations
[UPSC CSE 2026] Polarisation and Modern Optics (Q315, 15M)
The aperture width of a laser light source of wavelength 6000\text{ \AA} is 3\text{ mm} and its power is 20\text{ mW}. Calculate the light intensity at a distance of 200\text{ m} from the light source.
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