Question

7.8 Refractive Index​

Answer 1

7.8.1 Refractive index

Refractive index (given the symbol n) is an important optical property, as it is a measure of how much a particular material can change the direction of a ray of light (i.e. refract it) as it passes through that material. A high refractive index material will change the direction much more than a low one, so the material for a spectacle lens, which has to bend the light rays to the correct angle for the eye, can be made thinner.

Refractive Index, n, can be expressed as the change in the angle of light passing into a material, hence

n=sini /sinr

Answer 2

Explanation:

The change in the direction of a light ray while entering different media is different.It is related to the refractive index of the medium.The value of refractive index is different for different media and also for light of different colours of same medium.