A transparent solid cylindrical rod has a refractive index of 2//sqrt3 It is surrounded by air. A light ray is incident at the midpoint 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 transparent solid cylindrical rod has a refractive index of 2//sqrt3

1.	A transparent solid cylindrical rod has a refractive index of 2//sqrt3 It is surrounded by air. A light ray is incident at the midpoint 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
Answer» `sin^-1 (sqrt3/2)` `sin^-1 (2/sqrt3)` `sin^-1(1/sqrt3)` `sin^-1(1/2)` ANSWER :C