Question

Why does a ray of light travelling from one medium to another change its path?

Answer 1

1. A ray of light traveling from one medium to another changes its path because there is a change in the speed of the ray of light. This change in speed is caused due to the difference in the optical density of the two mediums.
2. The optical density of the medium decides how much the ray of light will be bent.
3. This phenomenon of bending the ray of the light is referred to as refraction.