Question

A thin prism of angle $A=6^{\circ }$ produces minimum deviation of ${\delta }_{min}=3^{\circ }$. Find the refractive index of the material of the prism.

Answer 1

Given :
${\delta }_{min}=3^{\circ };A=6^{\circ }$

Deviation, ${\delta }_{min}=(\mu -1)A$

$\Rightarrow \mu =\frac{{\delta }_{min}}{A}+1=\frac{3}{6}+1$

$\therefore \mu =1.5$

Hence, option $\left(c\right)$ is correct.