A 55cm -thick layer of oil n146 is sandwiched between a, Ask an Expert

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A 5.5cm -thick layer of oil (n=1.46) is sandwiched between a 1.1cm -thick sheet of glass and a 2.3 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 8.9 cm-thick sandwich?

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