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What value relates the speed of light in a vacuum to speed of light in a given material?

Sagot :

The index of refraction

Hold up let me tell you why!!!
The index of refraction which is also known as refractive index is defined as speed of light in a vacuum divided by the speed of light in a giver material.
The formula for index of refraction is:
(n = c ÷ v)
This is where n represents index of refraction
C which represents of light in a vacuum
And V represents speed of light in a given material.
So the speed and the direction of light changes when it moves from one medium to another. And the change direction is basically called refraction......

Hope this is correct and helps you a whole lot!!!