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A thin beam of light enters a thick plastic sheet from air at an angle of 30.4 with the normal and continues in the sheet

A thin beam of light enters a thick plastic sheet from air at an angle of 30.4 with the normal and continues in the sheet at an angle of 23.0 with the normal. What is the index of refraction of the plastic? Use two decimals in your answer.Reference: Eq. (26-11), Exercise 26-12.

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