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Question: A 3.7cm -thick layer of oil is sandwiched between a 1.0cm -thick sheet of glass and a 2.3cm -thick sheet of polystyrene plastic.

Part I: How long (in ns) does it take light incident perpendicular to the glass to pass through this 7.0cm -thick sandwich?

I need tutor help to solve the above question and express your answer to two significant figures and include the appropriate units. Thanks.

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