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Umbra, penumbra and antumbra
Distinct parts of a shadow / From Wikipedia, the free encyclopedia
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The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Diagram_of_umbra%2C_penumbra_%26_antumbra.png/640px-Diagram_of_umbra%2C_penumbra_%26_antumbra.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Kernschatten_und_Halbschatten.svg/220px-Kernschatten_und_Halbschatten.svg.png)
These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.