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There is a film of oil (n=1.52) on a wet pavement (n=1.33). the film has a...

There is a film of oil (n=1.52) on a wet pavement (n=1.33). the film has a minimum non-zero thickness such that it is dark when viewed in red light (wavelength = 660 nm in vacuum). Assuming that the visible light spectrum extends from 380nm to 750nm, what wavelength in vacuum will you see when you look at the film in broad daylight?

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