cse • paper_1 • waves_oscillationscse-1999-subject-02-005
Laser light — UPSC CSE 1999 Physics PYQ
Buy PYQ Solution Manual →A short-focus lens is used to focus a laser beam of wavelength 6328 Å. If the beam width is comparable to the focal length of the lens, calculate the area of cross-section of the region of focus.
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