Problem: A layer of benzene that has thickness t is floating on water. Benzene has refractive index 1.50 and the refractive index of water is 1.33. Coherent light of wavelength 490 nm in air is incident on the benzene layer normal to the surface of the benzene. For what minimum nonzero thickness of the layer of benzene will there be destructive interference for the light reflected at the top and bottom surfaces of the benzene?

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A layer of benzene that has thickness t is floating on water. Benzene has refractive index 1.50 and the refractive index of water is 1.33. Coherent light of wavelength 490 nm in air is incident on the benzene layer normal to the surface of the benzene. For what minimum nonzero thickness of the layer of benzene will there be destructive interference for the light reflected at the top and bottom surfaces of the benzene?

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