A thin film of alcohol (n = 1.36) lies on a flat glass
Chapter 27, Problem 47P(choose chapter or problem)
Problem 47P
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 λ = 512 nm and a maximum for λ = 640 nm. What is the minimum thickness of the film?
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