Relative Refractive Index

Relative Refractive Index

### Formula

$$\mu_{21}=\frac{\mu_2}{\mu_1}$$

### Alternative Form

$$\mu_{21}=\frac{v_1}{v_2}$$

### Terminologies

- μ21 → Refractive index of medium 2 with respect to medium 1.

- v1, v2 → Speed of light in respective mediums.

### Usage

- Used in refraction between two mediums.