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A thin film of ethyl alcohol (n = 1.36) lies on top of water (n = 1.33). When sunlight is incident at right angles to this film, the only colors that are absent from the reflected light are orange (λ = 600 nm) and blue (λ = 450 nm). Find the thickness of the ethyl alcohol film

n=1.00
ethyl alcohol
181=4
woter
EE'lau

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