Question

From the figure shown, establish a relation between ${\mu }_1,{\mu }_2$ and ${\mu }_3$.

• A. ${\mu }_1<{\mu }_2<{\mu }_3$
• B. ${\mu }_1={\mu }_3<{\mu }_2$
• C. ${\mu }_3={\mu }_1>{\mu }_2$
• D. None of these

Answer 1

The correct option is B ${\mu }_1={\mu }_3<{\mu }_2$


We can see that between medium $1$ and medium $3$, there is no deviation. Thus, ${\mu }_1={\mu }_3$.

Now considering light rays going from medium $3$ to medium $2$, we observe that the rays bend towards the normal.


Hence, medium $2$ is optically denser than medium $3$.

$\Rightarrow {\mu }_2>{\mu }_3$

or ${\mu }_1={\mu }_3<{\mu }_2$

Therefore, option $\left(b\right)$ is correct.