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A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.50)....

A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.50). White light is incident normal to the film. In the reflections, fully destructive interference occurs at 480 nm and fully constructive interference at 560 nm. Calculate the thickness of the acetone film.

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