Question

A ray of light traveling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of ${45}^o$. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value(s) of n from the following

• A. 1.3
• B. 1.4
• C. 1.5
• D. 1.6

Answer 1

Answer: (C), (D)

The correct options are
C 1.5
D 1.6

${\mu }_{min}=\frac{1}{sin45}=\sqrt{2}=1.414$

possible values of $\mu$ are $1.5$ and $1.6$

option $C,D$ are correct