define Refractive Index of a medium and Express it mathematically
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the refractive index of a medium is defined as the ratio of speed of light in vaccum to the speed of light in the medium
refractive index=speed of light in vaccum÷speed of light in the medium
=c÷v
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Bending of light ray is called Refraction
refractive index (n) = c/v
Refractive index means that speed of light in vacuum divided by speed of light in medium
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