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A transparent solid cylindrical rod has ...

A transparent solid cylindrical rod has a refractive index of `frac(2)(sqrt3)`. Itis 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

A

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

B

`sin^-1 (sqrt3 // 2)`

C

`sin^-1 (2 // sqrt3)`

D

`sin^-1 (1 // sqrt3)`

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