A 5.6 cm -thick layer of oil n 1.46 is sandwiched between a, Ask an Expert

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A 5.6 cm -thick layer of oil (n =1.46) is sandwiched between a 1.5 cm -thick sheet of glass and a 2.0 cm -thick sheet of polystyrene plastic (n = 1.59.) How long (in ns) does it take light incident perpendicular to the glass to pass through this 9. cm -thick sandwich?

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