Kopie von parabel - parabol

Author:Birgit Lachner, Sonny Krag

Hvorfor hedder en parabol, 'Parabol'? Har det mon noget med en parabel at gøre? a, b og c styrer parablen x_0 og x_1 styrer de lodrette lysstråler som reflekteres i parabolen/parablen.

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