Question

reference of refraction of light ​

Answer 1

Answer:

The index of refraction for any medium is a dimensionless constant equal to the ratio of the speed of light in a vacuum to its speed in that medium. The law of refraction, or Snell's law, predicts the angle at which a light ray will bend, or refract, as it passes from one medium to another.

Answer 2

When the ray of light travel from one medium to another it is bend towards the normal.This is happen because when the ray travel from rarer to denser medium it velocity decrease because of the material's quantity of mass body in per unit area.

There are two laws of refraction

First,

The incident ray,the refracted and normal lies on same point.

Second,

The angle of incident and refraction are constant.

The refraction is measured by using the angle from where it is bent

like,

the incident angle is 40degree and the refracted angle is 20 degree than refraction is 2.

The refraction has no units.

The formula to find refraction is

$\frac{sin \: i}{sin \: r}$

There are many examples of refraction on nature like twinkling of stars,actual sunrise and Sunset.