Question

Hi,

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What is meant by the refractive index of a material.

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Answer 1

hellooo
the ratio of speed of light in vacuum to the speed of light in medium is called refractive index
hope it helps u ....

Answer 2

Refractive index μ of a medium is the ratio of speed of light rays in vacuum to the speed of light in that medium.

Refractive index of vacuum =1 (reference) . For all transparent media it's more than 1.

μ can be calculated by measuring the angles: incidence ( i ) and refraction (r) when light rays undergo refraction at the surface between two media.

μ2 /μ1 = Sin i / Sin r.

μ1 is the index of first medium.