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Physics, Please Help

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A 5.7 cm thick layer of oil (n=1.46) is sandwiched between a 1.1cm-thick sheet of glass and a 2.5cm -thick sheet of polystyrene plastic (n=1.59).

How long (in nm) does it take light incident perpendicular to the glass to pass through this 9.3cm -thick sandwich?

I cant seem to find the correct answer; any help would be greatly appreciated!

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