cse • paper_1 • waves_oscillations
[UPSC CSE 1987] Interference (Q223, 20M)
A beam of light of wavelength 5.82 \times 10^{-7}\text{ m} falls normally on a glass wexge with the wedge angle of 20''. If the refractive index of glass is 1.5, find the number of dark interference fringes per centimetre of the wedge length.
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