Answer;
The refractive index of a medium is defined as the ratio of speed of light in vacuum to that of speed of light in medium.
Explanation;
- Refractive index is the measure of the bending of a ray of light when passing from one medium into another. The refractive index of a medium with respect is the ratio of velocity of light in air to the velocity of light in the medium.
- That is; refractive index,n = velocity of light in air divided by velocity of light in the medium. or velocity of light in vacuum,c divided byvelocity of light in a substance, v
- Refractive index may also be defined as the ratio of sine of angle of incidence to the sine of angle of refraction. That is; sin i/sin r
