• # question_answer A prism of ${{6}^{o}}$ is made of material of refractive index $\frac{5}{3}$. The deviation caused by it is:               A)  ${{2}^{o}}$                      B)  ${{8}^{o}}$C)  ${{4}^{o}}$                      D)  none of these

The relation between $\delta$ and $\mu$ is $\delta =(\mu -1)\,A$ $\Rightarrow$               $\delta =\left( \frac{5}{3}-1 \right)={{6}^{o}}$ $\Rightarrow$               $\frac{2}{3}\times {{6}^{o}}={{4}^{o}}$