A ray of light travelling in the direction is incident on a plane mirror

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

A ray of light travelling in the direction 12(i^+3j^)\frac{1}{2}(\hat{i} + \sqrt{3}\hat{j}) is incident on a plane mirror. After reflection, it travels along the direction 12(i^−3j^)\frac{1}{2}(\hat{i} - \sqrt{3}\hat{j}) . The angle of incidence is (1) 30∘30^\circ (2) 45∘45^\circ (3) 60∘60^\circ (4) 75∘75^\circ

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