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refractive index is the ratio of speed of light in vaccum to the speed of light in actual substance

Explanation :- Actually light moves in a straight line with a speed 3X108 in vacuum only , in other substances the speed of light is decreased due to the bombardment of molecules of the substance. Refractive index also gives us the information about the amount of bending the light suffers when it enters from one medium to other.

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12y ago

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