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A transparent solid cylindrical rod has ...

A transparent solid cylindrical rod has a refractive index of `(frac(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 `Phi` for which the light ray grazes along the wall of the rod is

A

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

B

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

C

`sin^-1 (sqrt2)`

D

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

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