A ray of light travelling in the directi...

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

`45^@`

`75^@`

`30^@`

`60^@`

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