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{{short description|Reflection with light scattered at random angles}}▼
{{For|reflection of charged particles|Scattering from rough surfaces}}
▲{{short description|Reflection with light scattered at random angles}}
[[File:Lambert2.gif|thumb| Diffuse and specular reflection from a glossy surface.<ref>
{{cite book
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==Colored objects==
Up to this point white objects have been discussed, which do not absorb light. But the above scheme continues to be valid in the case that the material is absorbent. In this case, diffused rays will lose some wavelengths during their walk in the material, and will emerge colored.
Diffusion affects the color of objects in a substantial manner because it determines the average path of light in the material, and hence to which extent the various wavelengths are absorbed.<ref>Paul Kubelka, Franz Munk (1931), ''Ein Beitrag zur Optik der Farbanstriche'', Zeits. f. Techn. Physik, '''12''', 593–601, see [https://web.archive.org/web/20110717155703/http://web.eng.fiu.edu/~godavart/BME-Optics/Kubelka-Munk-Theory.pdf ''The Kubelka-Munk Theory of Reflectance''] {{webarchive|url=https://web.archive.org/web/20110717155703/http://web.eng.fiu.edu/~godavart/BME-Optics/Kubelka-Munk-Theory.pdf |date=2011-07-17 }}</ref> Red ink looks black when it stays in its bottle. Its vivid color is only perceived when it is placed on a scattering material (e.g. paper). This is so because light's path through the paper fibers (and through the ink) is only a fraction of millimeter long. However, light from the bottle has crossed several centimeters of ink and has been heavily absorbed, even in its red wavelengths.
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==See also==
* [[Diffuser (optics)|Diffuser]]
* [[Reflectivity]]
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