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A thin film of soap with n = 1.35 hanging in the air reflects dominantly red...

A thin film of soap with n = 1.35 hanging in the air reflects dominantly red light with ? = 620 nm. What is the minimum thickness of the film?

Now this film is on a sheet of glass, with n = 1.46. What is the wavelength of the light in air that will now be predominantly reflected?

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