please tell me what is refractive index..?
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the ratio of velocity of light in vaccum to its velocity in specified medium is called refractive index.
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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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