What is refractive index of the plastic

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Light traveling in henzene (n 1.50) is incident on the flat surface of a piece of plastic. It is found that if the light in the benzene is incident at an angle with respect to the normal to the surface of the plastic that is greater than 60°. none of the light passes into the plastic. What is refractive index of the plastic?

Reference no: EM13517661

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