Problem: A layer of benzene (n = 1.50) that is 300 nm thick is floating on water (n = 1.33). There is air above the benzene. For normal incidence to the surface of the benzene, what is the largest wavelength of visible light in air for which there will be destructive interference between the light reflected from the top and bottom surfaces of the benzene layer? (Assume that the range of visible wavelengths in air is 400 nm to 700 nm).

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A layer of benzene (n = 1.50) that is 300 nm thick is floating on water (n = 1.33). There is air above the benzene. For normal incidence to the surface of the benzene, what is the largest wavelength of visible light in air for which there will be destructive interference between the light reflected from the top and bottom surfaces of the benzene layer? (Assume that the range of visible wavelengths in air is 400 nm to 700 nm).

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