One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence `i = 45^(@)`. Refractive index of glass a is given as 1.5. The diviation of the ray of light from its initial path when it comes out of the slab is
A. `90^(@)`
B. `180^(@)`
C. `120^(@)`
D. `45^(@)`