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puddle of water has an oily thin film floating on it. A beam of light is...

puddle of water has an oily thin film floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 532 nm and the indices of refraction of the oil and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?

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