A transparent solid cylindrical rod has a refractive index of `(2)/(sqrt3)` .It is surrounded
Channel: Doubtnut
Date: 2020-07-05

A transparent solid cylindrical rod has a refractive index of `(2)/(sqrt3)` .It is surrounded by air. 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: