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A thin film of liquid with index of refraction 1.39 floats atop the still surface of a pond (index of refraction 1.33). Looking straigh
at the surface of the pond, you notice that it strongly reflects red light, of wavelength 720 nm.
What is the minimum non-zero thickness of the film for this to be true? Enter your answer in units of nanometers (nm). Include
three (3) significant figures.

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