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CSE · Paper I · Waves & Opticscse-1999-subject-02-005

Laser light (Question 1 (20 Marks)) — UPSC Physics Optional CSE 1999 Paper I

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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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