Duté zrcadlo - paprsek rovnoběžný s osou - verze 2

Author:
Martin Vinkler
Jak se od dutého zrcadla odráí paprsek rovnoběžný s optickou osou?
GeoGebra Applet
http://gregegan.customer.netspace.net.au/SCIENCE/Catacaustics/Catacaustics.html http://en.wikipedia.org/wiki/Nephroid http://mathworld.wolfram.com/CircleCatacaustic.html http://divus.cc/praha/cs/article/three-sources-and-three-parts-of-geometrising-visions-of-ladislav-danek

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