Image: Kernschatten und Halbschatten
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Description: A: Umbra B: Penumbra L1,L2: Light sources
Author: Klaus-Dieter Keller
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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