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Violet light of wavelength 400 nm in air is incident along a normal line to a plane of glass (n=1.50)that has a 120 nm thick transparent coating, with an index of refraction somewhere between 1.55 and2.0. There appears to be no reflected light to an observer above. What is the index of refraction of thecoating?a) 1.57b) 1.67c) 1.77d) 1.87e) 1.97

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