what is refractive index (small answer I will mark you as brainly)
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Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance,
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The refractive index of vacuum is taken as exactly one . When the refractive index of any transparent medium is measured relative to vacuum , the measured value is called Refractive index of that medium.
sin i / sin r
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