One side of a glass slab is silvered as ...

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

`90^(@)`

`180^(@)`

`120^(@)`

`45^(@)`

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