Problem: A thin film with thickness t is placed on the surface of a flat piece of glass. The film has n = 1.20 and the glass has n = 1.50. For air with wavelength in air of 500 nm incident perpendicular to the surface of the film, what is the minimum nonzero thickness of the film for which there will be constructive interference between the light reflected from the top and bottom surfaces of the film?

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A thin film with thickness t is placed on the surface of a flat piece of glass. The film has n = 1.20 and the glass has n = 1.50. For air with wavelength in air of 500 nm incident perpendicular to the surface of the film, what is the minimum nonzero thickness of the film for which there will be constructive interference between the light reflected from the top and bottom surfaces of the film?

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