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Regnbuen
http://eo.ucar.edu/rainbows/
http://www.geom.uiuc.edu/education/calc-init/rainbow/
http://www.geom.uiuc.edu/education/calc-init/rainbow/refraction.html
Fermats princip og Snells lov
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/fermat.html
http://scienceworld.wolfram.com/physics/SnellsLaw.html
Brydning, refleksion, indfaldsvinkel, brydningsvinkel og udfaldsvinkel
http://scienceworld.wolfram.com/physics/AngleofIncidence.html
http://www.geom.uiuc.edu/education/calc-init/rainbow/refraction.html
http://scienceworld.wolfram.com/physics/AngleofRefraction.html
http://scienceworld.wolfram.com/physics/AngleofReflection.html
http://scienceworld.wolfram.com/physics/IndexofRefraction.html
Flere oplysninger om farver
http://dc2.uni-bielefeld.de/dc2/farben/inhalt1.htm
Dette tyske link har næsten alt om farver.
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