A thin film of alcohol (n = 1.36) lies on a flat glass plate (n = 1.48). When monochromatic light is incident perpendicu

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A thin film of alcohol (n = 1.36) lies on a flat glass plate (n = 1.48). When monochromatic light is incident perpendicu

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A thin film of alcohol (n = 1.36) lies on a flat glass plate (n= 1.48). When monochromatic light isincident perpendicular to the surface (that is, normal to thesurface), the reflected light is aminimum for 512 nm and a maximum for 640 nm. What is the minimumthickness of the film?
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