A flat sheet of ice has a thickness of 20cm it is on top of, Ask an Expert

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A flat sheet of ice has a thickness of 2.0cm. It is on top of a flat sheet of crystalline quartz thathas a thickness of 1.1cm. Light strikes the ice perpendicularly and travelsthrough the quartz. In the time it takes the light totravel through the two sheets,

a) How far (in cm) would it have to travel invacuum?

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