A thin film of oil with index of refraction of 1.50 sits on top of a pool

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A thin film of oil with index of refraction of 1.50 sits on top of a pool of water with index of refraction of 1.33. When light is incident on this film, a maximum is observed in reflected light at 480 nm and a minimum is observed in reflected light at 600 nm, with no maxima or minima for any wavelengths between these two. What is the thickness of the film?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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