A thin film with index of refraction n = 1.49 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a…

A thin film with index of refraction n = 1.49 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a shift of 8.0 bright fringes of the pattern produced by light of wavelength 693 nm, what is the film thickness?

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