Physics

A film of gasoline (n=1.40) floats on water (n=1.33). Normally incident blue light of a wavelength 480 nm, appears bright blue due to constructive interference. Determine the minimum non-zero thickness of the film

Please Help, I've been stuck in this question for two days :-(

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    A film of gasoline (n=1.40) floats on water (n=1.33). Normally incident blue light of a wavelength 480 nm, appears bright blue due to constructive interference. Determine the minimum non-zero thickness of the film

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