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A laser light is pointed at a mirror as shown at right. If measures , what are the measures of and ? Justify your reasons.

Angle and angle are separated by a vertical angle. Does that say anything about their value? Also, angle is a reflection angle.

because vertical angles are equal.
because the angle of incidence equals the angle of reflection.

A light source, A, hits a mirror at an angle x between the mirror and the source. It refracts at an angle, z. between the mirror and the line of refraction B prime. The light source line extends behind the mirror to a point B. The angle opposite, x, between the mirror and B is, y.