Reflection of Light
light bouncing off a surface

Light is said to be reflected when the angle at which light initially strikes a surface is equal to the angle at which light bounces off the same surface.

In the diagram above, light strikes a surface at an angle "a" and leaves at an angle "b" (relative to that surface). Because angle "a" is equal to angle "b", this is an example of reflected light.

Light, Optics
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Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.