Question a film of oil of index of refraction n 143 floats, Ask an Expert

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Question: A film of oil of index of refraction n = 1.43 floats on water (n = 1.33). When illuminated with white light at normal incidence, light of wavelengths 686 and 490 nm is predominant in the reflected light.

Part A: Determine the minimum possible thickness of the oil film.

..... nm

I want help to find the minimum possible thickness of the oil film.

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