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

One side of a glass slab is silvered as shown in figure. A ray of light is incident on the other side at angle of incident `i=30^(@)`. Refractive index of glass is given as 1.5 the deviation of the ray of light from its intial path when it comes out of slab is

A

`90^@`

B

`30^@`

C

`120^@`

D

`60^@`

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