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Added more explanation of why diffuse reflection makes visibility of objects on many circumstances. |
Not really accurate or useful to say. Mirrors are not invisible. You can see a mirrored object just fine under most conditions. |
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A surface built from a non-absorbing powder such as [[plaster]], or from fibers such as paper, or from a [[polycrystalline]] material such as white [[marble]], reflects light diffusely with great efficiency. Many common materials exhibit a mixture of specular and diffuse reflection.
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 an observer's eye over a wide range of angles of the observer with respect to the object.
==Mechanism==
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