define refractive index what is the meaning the refractive index of water is 1.33
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It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium
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refractive index is nothing but the ratio of the velocity of light in air with respect to the other medium.
the refractive index of water is 1.33 it mean that the velocity of light decreases by the factor of 1.33
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