Question a thin film of alcohol n136 lies on a flat glass, Ask an Expert

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Question: A thin film of alcohol (n=1.36) lies on a flat glass plate (n=1.51). When monochromatic light, whose wavelength can be changed, is incident normally, the reflected light is a minimum for 504nm and a maximum for 630nm.

Question 1: What is the minimum thickness of the film?

Please use as much detail as possible in your answer. Thank you.

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