http://www.glenbrook.k12.il.us/gbssci/phys/Class/light/lighttoc.html
http://www.learner.org/teacherslab/science/light/color/
http://www.fi.edu/color/color.html
http://www.tooter4kids.com/Light_Color/Light_and_Colorindex.htm
http://homeschooling.gomilpitas.com/explore/optics.htm
http://www.skytopia.com/project/light/light.html
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