Question

What is Refractive index​

Answer 1

Answer:

optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

Answer 2

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Refractive index is a measure of how much speed of light changes when it enter the medium from air.

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Absolute refractive index is the ratio of speed of light in vacuum or air to speed of light in the medium. c. n=—— ν