Question

A small angle prism $(\mu =1.62)$ gives a deviation of $4.8^{\circ }$ . The angle of prism is

• A. $5^{\circ }$
• B. $6.36^{\circ }$
• C. $3^{\circ }$
• D. $7.74^{\circ }$

Answer 1

Answer: (D)

Here, $\mu =1.62,\delta =4.8^{\circ }$
$\delta =\left(\mu -1\right)A$
or $A=\frac{\delta }{\left(\mu -1\right)}$
$=\frac{4.8}{\left(1.62-1\right)}=7.74^{\circ }$