Question

A light ray is passing through three different media shown below. Which of the following options are correct regarding the refractive indices of these media?​

Answer 1

We observe that light bends away from normal when it goes from ${\mu }_{2}to{\mu }_3$. Thus, we conclude that light moves from a denser to rarer medium. So, ${\mu }_2>{\mu }_3$.

Also, we observe no refraction when light moves from ${\mu }_{3}to{\mu }_4$.
Thus, these two mediums will have the same refractive index. So, ${\mu }_3={\mu }_4$.