Question

The refractive index of a prism is 2.This prism can have a maximum refracting angle of

• A. ${90}^{\circ }$
• B. ${60}^{\circ }$
• C. ${30}^{\circ }$
• D. ${45}^{\circ }$

Answer 1

The correct option is B ${60}^{\circ }$

$Sinc=\frac{1}{\mu }=\frac{1}{2}C={30}^{\circ }$
Limiting angle $A=2c=2\times 30={60}^{\circ }$