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A layer of transparent plastic (n = 1.66) on glass (n = 1.52) looks dark when viewed in reflected light whose wavelength is 578 nm in vacuum.
A layer of transparent plastic (n = 1.66) on glass (n = 1.52) looks dark when viewed in reflected light whose wavelength is 578 nm in vacuum. Find the two smallest possible nonzero values for the thickness of the layer.