Problem: A thin film with thickness t coats a flat piece of glass. There is air above the film. The film has n = 1.2 and the glass has n = 1.5. Light of wavelength 400 nm in the air strikes the film at normal incidence. What is the smallest thickness of the film for which there will be destructive interference between the light reflected at the upper and lower surfaces of the film?

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A thin film with thickness t coats a flat piece of glass. There is air above the film. The film has n = 1.2 and the glass has n = 1.5. Light of wavelength 400 nm in the air strikes the film at normal incidence. What is the smallest thickness of the film for which there will be destructive interference between the light reflected at the upper and lower surfaces of the film?

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