Question

Define refraction index of a medium and express it mathematically

Answer 1

bending nature of a light ray is known as refraction.
refractive index (n)=c/v
refractive index means that speed of light in vacuum divided by speed of light in medium

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Answer 2

Explanation:

Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v. ... refractive index. Diagram of a light ray being refracted.