A ray of light traveling in air strikes the surface of a certain plastic slab (with unknown index of refraction) at 54.0 degrees with respect to the normal in air. travels in the plastic slab at 23.0 degrees with respect to the normal. Part a: calculate the index of refraction of the plastic material. It the value as odd number Part b: calculate the critical angle of the plastic material in air . Report this numerical value along with your work that lead to it in the even numbered

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