Question

What is the refractive index of vacuum?​

Answer 1

The vacuum has a refractive index of 1. The refractive index of other materials can be calculated from the above equation. Higher the refractive index, the higher the optical density and slower is the speed of light

Answer 2

Answer:

The refractive index of the vacuum is one.

Explanation:

The refractive index is 1 because the light travels slower in the air.

Refractive index is also known as the index of refraction or refractive index of a material. Increase in the refractive index corresponds to a decrease in the speed of the light through the material.