Question

Define refractive index.
mention the formula used to calculate it.

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Answer 1

Step-by-step explanation:

Refractive index refers to the ratio between the speed of an electromagnetic wave in a vacuum and its speed in another medium. It indicates the degree of refraction that would occur in a particular material. Furthermore, the refractive index through a vacuum is 1. One can define the normal as the perpendicular line to the surface of the interface. In such a case, a higher value of refractive index would certainly mean that the bend of the ray is towards the normal.

n = c/v

n = refractive index of the medium

c = speed of light when in vacuum

v = speed of light when in medium

Answer 2

The refractive index is the measure of bending of a light ray when passing from one medium to another. It can also be defined as the ratio of the velocity of a light ray in an empty space to the velocity of light in a substance, n = c/v.