A horizontal plane mirror coincides with the -plane

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

Problem

A horizontal plane mirror coincides with the xyxy-plane. A light ray travelling in air has direction vector vi=(−3, 4, −12)\mathbf{v_i}=(-3,\,4,\,-12) (components along xx, yy, zz axes respectively) and strikes the mirror. Which of the following vectors could correctly represent the direction of the REFLECTED ray? (a) (3, 4, 12)(3,\,4,\,12) (b) (−3, 4, 12)(-3,\,4,\,12) (c) (−3, 4, 0)(-3,\,4,\,0) (d) (−3, −4, 12)(-3,\,-4,\,12)

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