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Question

A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism, the angle of minimum deviation is measured to be 40o. What is the refractive index of the material of the prism? If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light. The refracting angle of the prism is 60o.

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