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Wave Optics
Question
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Define refractive index of a transparent medium. A ray of light passes through a triangular prism. Plot a graph showing the variation of the angle of deviation with the angle of incidence.

Answer

Ratio of the speed of light in air (vacuum) to the speed of light in the medium is called the refractive index of the medium. 

Graph: The graph of angle of deviation (δ) versus angle of incidence (i) for a triangular prism is given as follow:

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