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The visibility of objects, excluding light-emitting ones, is primarily caused by diffuse reflection of light: it is diffusely-scattered light that forms the image of the object in the observer's eye.
▲[[Image:Diffuse reflection.gif|thumb|right|Figure 1 – General mechanism of diffuse reflection by a solid surface ([[refraction]] phenomena not represented)|250px]]
[[File:Diffuse reflection.svg|thumb|Figure 2 – Diffuse reflection from an irregular surface|250px]]
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