When monochromatic light whose wavelength can be changed is


A uniform thin film of alcohol (n=1.36)  lies on a flat glass plate (n=1.56). When monochromatic light, whose wavelength can be changed, is incident normally, the reflected light is a minimum for λ=512nm and a maximum for λ=640nm.

What is the minimum thickness of the film?

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Physics: When monochromatic light whose wavelength can be changed is
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