define refractive index ?????
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it is define as the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
Anonymous:
the definition given by u is of absolute refractive index....
for your kind information , a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium.... this is known as absolute ok
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the angle at which light bend
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