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A thin film of oil (n=1.4) floats on water (n=1. When sunlight is incident at right angles to this film, the only colors that are absent from the...

A thin film of oil (n=1.4) floats on water (n=1.33). When sunlight is incident at right angles to this film, the only colors that are absent from the reflected light are blue (458nm) and red (687nm). Estimate the thickness of the oil film.

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