MCQ
A transparent solid cylindrical rod has a refractive index of $\frac{4}{\sqrt {3}}$ It is surrounded by a medium of refractive index $2$. A light ray is incident at the mid-point of one end of the rod as shown in the figure.
The incident angle $\theta $ for which the light ray grazes along the wall of the rod is
- A${\sin ^{ - 1}}\left( {\frac{1}{2}} \right)$
- ✓${\sin ^{ - 1}}\left( {\frac{2}{{\sqrt 3 }}} \right)$
- C${\sin ^{ - 1}}\left( {\frac{1}{{\sqrt 3 }}} \right)$
- D${\sin ^{ - 1}}\left( {\frac{{\sqrt 3 }}{2}} \right)$
