we know that,
Refractive index of the medium=speed of light in air /speed of light in medium
therefore,
speed of light in medium=
speed of light in air /refractive index in the medium
since,
speed of light in air is always constant
hence
speed of light in the medium=constant/refractive index of the medium
hence
we can say that lower refractive index of the medium, the higher is the speed of light .
| Refractive Index water would be higher | |
| Kerosene | 1.44 |
| Turpentine | 1.47 |
| Water | 1.33 |