cse • paper_1 • waves_oscillationscse-1992-subject-02-007
Ruby laser — UPSC CSE 1992 Physics PYQ
Buy PYQ Solution Manual →A ruby laser produces a beam of light of wavelength 0.3\text{ \AA} with a circular cross-section 1\text{ cm} in diameter. Calculate the diameter of this beam at a distance of 1000\text{ kilometers}.
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