Suppose the thickness of a thin soap film (n = 1.32) surrounded by air is non uniform

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Suppose the thickness of a thin soap film (n = 1.32) surrounded by air is non uniform and gradually tapers. Monochromatic light of wavelength 550 nm illuminates the film. At the thinnest end, a dark fringe is observed. How thick is the film at the two dark fringes closest to that fringe?
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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