what is meant by refractive index
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refractive index is the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
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absolute refractive index is defined as a ratio of the speed of light in the vacuum and in selected medium
relative refractive index is defined as a ratio of speed of light in two different media
When in relative refrective index ,second medium is vacuum then both will be same
Formula n=c/v
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