Three sheets of plastic have unknown indices of refraction.Sheet 1 is placed on top of sheet 2, and a laser beam is directedonto the sheets from above so that it strikes the interface atan angle of 26.5° with the normal. The refracted beam insheet 2 makes an angle of 31.7° with the normal. The experimentis repeated with sheet 3 on top of sheet 2, and with thesame angle of incidence, the refracted beam makes an angleof 36.7° with the normal. If the experiment is repeated againwith sheet 1 on top of sheet 3, what is the expected angle ofrefraction in sheet 3? Assume the same angle of incidence.

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