Three parallel beams of light are reflected off a mirrored surface: Reflection is the change in direction of a wave front at an interface between two different media so that the wave front returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.

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Keywords: archival, archive, beams, frontinterfacelightspectrumcolouropticsphysics, historical, history, light, mirrored, parallel, parallelbeamslightreflectedmirroredsurfacereflectionwave, reflected, surface