2020 · Q90
If the speed of light in air is represented by c and the speed in a medium is v, then the refractive index of the medium can be calculated using the formula
General KnowledgePhysics
- Av/c
- Bc/v
- Cc/(2.v)
- D(c – v)/c
Explanation
The refractive index n is defined as the ratio of the speed of light in vacuum (or air), c, to its speed v in the medium: n equals c divided by v. Since light slows down in a medium, n exceeds 1. The correct answer is the ratio of the speed of light in air to the speed of light in the medium.