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cse • paper_1 • waves_oscillationscse-1991-subject-02-003

Refraction of light — UPSC CSE 1991 Physics PYQ

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A soap film of refractive index 1.33 is illuminated with light of different wavelength at an angle of 45^\circ. There is complete destructive interference for \lambda = 5890\text{\AA}. Find thickness of the film.

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