Question

Light travels at the speed of $2.25\times {10}^8$ m/s in medium A and $2\times {10}^8$ m/s in the medium B .Which medium is optically denser ? Is optical density related to the density of the medium?

Answer 1

Speed of light in $A=2.25\times {10}^{8}m/s$

Speed of light in $B=2\times {10}^{8}m/s$

optional density $\propto \frac{1}{speedoflight}$

$\therefore$ Medium $B$ will be optically denter than $A$.

The higher the density, the more molecules there are per unit volume, and the more light obstructed. Therefore, refraction index also increases.