Reflexion

Reflexion, in physics, refers to the process where a wave—such as light, sound, or electromagnetic radiation—bounces off a surface and changes direction without passing through it. When a wave hits a boundary between two different materials, part of it reflects back into the original medium. The angle at which the wave strikes the surface (angle of incidence) equals the angle at which it reflects (angle of reflection), according to the law of reflection. This principle explains how mirrors work and how echoes occur, playing a crucial role in various optical and acoustic systems.