Specular and Diffuse Reflection

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The reflection of light can be specular or diffuse. In the first case, parallel light rays are reflected on a smooth surface and the beam emerges parallel too, while in the second, the reflection is on a rough surface that disperses the rays in random directions.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Specular and Diffuse Reflection"
http://demonstrations.wolfram.com/SpecularAndDiffuseReflection/
Wolfram Demonstrations Project
Published: March 7 2011