Question

The refractive indices of media $A$, $B$ and $C$ are $2.25$, $1.25$ and $1.50$. Find the medium having b. lowest optical density.

Answer 1

1. The refractive index of a medium is defined as the ratio of the speed of light in the air to the speed of light in that medium.
2. The medium with a lower refractive index is termed an optically rarer medium.
3. The lower is the refractive index of the medium, the lower is the optical density of the medium.
4. Among the given media, medium B has the lowest refractive index.

Hence, medium B has the lowest optical density.