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A ray of light travelling in the direction `1/2 (hati+sqrt(3)hatj)` is incident on a plane mirror. After reflectiion, it travels along the direction `1/2(hati -sqrt(3)hatj)`. The angle of incidence is

A

`30^circ`

B

`45^circ`

C

`60^circ`

D

`75^circ`

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