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/(sqrt(3))` m, the angle of refraction produced is
`tan^(-1) ((sqrt(3))/2)`
`tan^(-1) (1- sqrt(2/3))`
`sin^(-1)(1-sqrt(2/3))`
`tan^(-1)(sqrt(2/(sqrt(3) - 1)))`