Question

Define Refractive Index of a medium.​

Answer 1

Explanation:

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Answer 2

Explanation:

In optics, the refractive index (also known as refraction index or index of refraction) of a material is a dimensionless number that describes how fast light travels through the material.

It is defined as A ray of light being refracted in a plastic block where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times slower in water than in a vacuum. Increasing the refractive index corresponds to decreasing the speed of light in the material.

$n = \frac{c}{v}$