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A prism is made of glass of unknown refr...

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

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`n~=1.53 and D_(m)` for prism in water `~=10^(@)`
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