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A 720 nm thick oil film floats on a plastic plate. White light incident from air...

A 720 nm thick oil film floats on a plastic plate. White light incident from air strikes the film at normal incidence. What visible wavelengths will be constructively reflected from the film? Take the wavelength of visible light in air to be from 400 nm to 700 nm. The index of refraction of the plate is 1.47 and that of the film is 1.60.

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