A light beam with a wavelength of 600 nm in air passes through film 1 (n1 =

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A light beam with a wavelength of 600 nm in air passes through film 1 (n1 = 1.2) of thickness 1.0μm, then through film 2 (air) of thickness 1.5 pm, and finally through film 3 (n3 = 1.8) of thickness 1.0μm. The beam is perpendicular to the film surfaces, which are parallel to one another.
(a) Which film does the light cross in the least time, and
(b) What is that least time?
(c) What is the total number of wavelengths (at any instant) across all three films together?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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