A film of soapy water (n = 1.33) on top of a sheet of crown glass (n = 1.52) has a thickness of 196 nm. What wavelength is most

Question

A film of soapy water (n = 1.33) on top of a sheet of crown glass (n = 1.52) has a thickness of 196 nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.) nm

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