Law of reflection states that when a light ray is incident on a reflecting surface then angle of incidence (i) = angle of reflection (r). If the incident ray is along (1/2)î + (√3/2)ĵ and the reflected ray is along (1/2)î - (√3/2)ĵ, then angle of incidence is :-

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G1 Physics · Accepted Answer

The component parallel to the mirror remains unchanged while the normal component reverses. The ray makes angle 30° with the normal because its normal component has magnitude √3/2. Therefore i = 30°.