Question

Absolute refractive indices of medium 'A' and medium 'B' are na,' and 'nb, respectively what is
the refractive index of medium 'B' with respect to medium 'A'? How does the velocity of light
vary with change in the optical density of the media? ​

Answer 1

Absolute refractive indices of medium 'A' and medium 'B' are 'n a' and 'n b', respectively. ... This means that light travels slower, in a medium with high optical density. Speed of light slows down in a optically denser because light interacts with the matter inside the denser medium.

Answer 2

When the light is going from vaccum to another medium,then the value of refractive index is called the absolute refractive index.