Question

it is the measure of speed of light through the material . ​

Answer 1

Answer:

The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v).

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Speed of light.

Answer 2

Answer:

The ratio between c and the speed v at whuch light travels in material is called the refractive index n of the material ( n = c/v ).

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