A film of oil of index of refraction n = 1.45 rests on an optically flat piece

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A film of oil of index of refraction n = 1.45 rests on an optically flat piece of glass of index of refraction n = 1.6. When illuminated with white light at normal incidence, light of wavelengths 690 nm and 460 nm is predominant in the reflected light. Determine the thickness of the oil film.

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