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The index of refraction of a substance is: A. the speed of light in the substance

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The index of refraction of a substance is: 

A. the speed of light in the substance 

B. the angle of refraction 

C. the angle of incidence 

D. the speed of light in vacuum divided by the speed of light in the substance 

E. measured in radians

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D. the speed of light in vacuum divided by the speed of light in the substance

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