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Refraction of Light

43. The refra...

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43. The refractive index of the material of the prismof an angle 60 degree is 1.62 for sodium light. The angle of minimum deviation for this light is: Why cannot we use the formula: deviation= (refractive index - 1) angle of prism??

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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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[Given:

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