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A thin film with an index of refraction of 1.60 is placed in one of the beams of a Michelson interferometer. If this causes a shift of 8 bright fringes in the pattern produced by light of wavelength 580 nm, what is the thickness of the film?
A) 1.5 mu m
B) 2.9 mu m
C) 3.9 mu m
D) 7.7 mu m
E) 16 mu m
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