The reflection of sound waves follows the same laws as the reflection of light. Specifically, the angles of incidence and reflection are equal, and both lie in the same plane as the normal to the reflecting surface at the point of incidence.
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The reflection of sound waves is governed by two main laws: the angle of incidence equals the angle of reflection, and the incident sound wave, reflected sound wave, and the normal (perpendicular) to the surface at the point of incidence all lie in the same plane.