<p><strong>Fig. 5.6.</strong> In a reflected wave, the angle of incidence equals the angle of reflection for wave direction. The normal line is the horizontal dotted line. Arrows represent direction of incoming wave fronts.</p>

Fig. 5.6. In a reflected wave, the angle of incidence equals the angle of reflection for wave direction. The normal line is the horizontal dotted line. Arrows represent direction of incoming wave fronts.

Image by Matthew Lurie