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A film of soapy water (n = 1.33) on top of a sheet of polystyrene has...

A film of soapy water (n = 1.33) on top of a sheet of polystyrene has a thickness of 168 nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface. (This is the apparent color of soapy film.) I tried 446.88 and it was still wrong.

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