A ray of light is incident on a surface ...

A ray of light is incident on a surface of glass slab at an angle `45^@`. If the lateral shift produced per unit thickness is `1//sqrt3`, the angle of refraction produced is

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

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

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

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

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