Question

What do you mean by the refractive index of a medium?

• A. A medium in which light travel with high speed
• B. A medium in which light travel with low speed
• C. A medium in which light travel with variable speed, but the speed will depend on medium to medium
• D. None of these

Answer 1

The correct option is C

A medium in which light travel with variable speed, but the speed will depend on medium to medium

The refractive index is the measure of the bending of a ray of light when passing from one medium into another. It is also the ratio of the velocity of light in a vacuum to its velocity in a specified medium, or n = $\frac{c}{v}$.