Question

The critical angle for total internal reflection in diamond is $24.5^{\circ }$ . The refractive index of the diamond is

• A. 2.45
• B. 1.41
• C. 2.59
• D. 1.59

Answer 1

Answer: (A)

Given, critical angle $C=24.5^{\circ }$
For total internal reflection
$\mu =\frac{1}{\sin C}=\frac{1}{\sin 24.5^{\circ }}\mu$
$=2.45\left[\sin 24.5^{\circ }=0.414\right]$