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Due to an unwanted oil spill, a thin film of oil of refractive index 1.40 floats...

Due to an unwanted oil spill, a thin film of oil of refractive index 1.40 floats on water (refractive index 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).

(a) Draw a diagram showing the reflected rays for either blue or red.

(b)Estimate the thickness of the oil film.

(c)If the only colors enhanced by reflection were blue and red, what would have been the thickness of the oil film?

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