Question: The thin film that forms a soap bubble has an index of refraction of 1. 42 . When white light strikes the outer surface of

The thin film that forms a soap bubble has an index of refraction of 1. 42 . When white light strikes the outer surface of the film at normal incidence, $625-\mathrm{nm}$ reflected light is especially bright. Derive an expression for the possible thicknesses of the film.

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