What is Refractive Index?
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In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v}}, where c is the speed of light in vacuum and v is the phase velocity of light in the medium.
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It is defined as the ratio of the speed of light in air to the speed of light in medium.
OR
It is the measure of bending of a light Ray when passing from one medium to another
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