A transparent solid cylinderical rod has...

A transparent solid cylinderical rod has a refractive index of `2sqrt(3)`. 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

`sin^(-1)((1)/(2))`

`sin^(-1)((sqrt(3))/(2))`

`sin^(-1)((2)/(sqrt(3)))`

`sin^(-1)((1)/(sqrt(3)))`

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