define absolut refractive index
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. 1. a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute indexof refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction) Symbol: n.
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Change of path of light from one medium to another (rarer to denser or denser to rarer ) is know its refractive index
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