A thin film of soap with n 138 hanging in the air reflects, Physics

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A thin film of soap with n 138 hanging in the air reflects

A thin film of soap with n = 1.38 hanging in the air reflects dominantly red light with λ = 699 nanometer. Calculate the minimum thickness of the film?

Now this film is on a sheet of glass, with n = 1.51. Find the wavelength of the light in air that will now be predominantly reflected?

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Physics: A thin film of soap with n 138 hanging in the air reflects

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