Which one of the following correctly states the law of reflection for a plane mirror?

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

Problem

Which one of the following correctly states the law of reflection for a plane mirror? (a)

i + r = 90^{\circ}

(b)

i = r

(c)

i = 2r

(d)

i + r = 180^{\circ}