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Physics 18 Online
OpenStudy (anonymous):

A thin film with index of refraction n=1.40 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a shift of 7.0 bright fringes of the pattern produced by light of wavelength 589 nm, what is the film thickness?

OpenStudy (vincent-lyon.fr):

Tip: What is the excess optical path travelled by light when crossing the film?

OpenStudy (anonymous):

I don't really know.

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