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Oil is spilled into a tiny puddle of water after a rain storm. The oil spreads...

Oil is spilled into a tiny puddle of water after a rain storm. The oil spreads out and forms a thin-film 5.0 μm thick (n = 1.5) on top of the water. The water has a depth of 5.0 mm.

a)How long does it take light, which is incident perpendicular to the oil slick, to pass through the oil?

b) How long does it take light to pass through the water?

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