What is refractive index?

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Orpita Dutta

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Measure of the bending of a ray of light as it passes from one medium to another. the ratio of the speed of radiation (as light) in one medium to the other medium.
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Physics, Chemistry, Biology and Mathematics (Pure and Business) Tutor For VIII-XII

It is the ratio of the speed of light in one medium (as air, glass, or a vacuum) to that in another medium.
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Math Magician

the ratio of the speed of radiation (as light) in one medium (as air, glass, or a vacuum) to that in another medium
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Computer Science Engineer

In optics, the refractive index or index of refraction n of a material is a dimensionless number that describes how light propagates through that medium. 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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