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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

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Let angle between the directions of incident ray and reflected ray be Q,
cos`theta=1/2(hati+sqrt3 hatj)*1/2(hati-sqrt3 hatj)`
cos`theta = -1/2`
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