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A 641-nm-thick soap film (n = 1.49) in air is illuminated with white light in a...

A 641-nm-thick soap film (n = 1.49) in air is illuminated with white light in a direction perpendicular to the film. For how many different wavelengths in the 300 to 700 nm range is there (a) fully constructive interference and (b) fully destructive interference in the reflected light?

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