Question

The critical angle for a medium with respect to air ${45}^0$. The refractive index of that medium with respect to air is:

• A. $\frac{\sqrt{3}}{2}$
• B. $\frac{2}{\sqrt{3}}$
• C. $\sqrt{2}$
• D. $\frac{1}{\sqrt{2}}$

Answer 1

Answer: (C)

$\sqrt{2}$

$C={45}^0$

${}^{med}{\mu }_a=\frac{1}{sinC}=\frac{1}{sin{45}^0}$

$=\frac{1}{\left(1\sqrt{2}\right)}=\sqrt{2}$