Learn about light from a high school physics site! How much can you understand? Try the links to "refraction at a boundary" and the "archer fish" http://www.physicsclassroom.com/Class/refrn/u14l1b.cfm
adventure game - color http://www.sanford-artedventures.com/play/color2/a1.html
Color and light http://www.thetech.org/exhibits_events/online/color/intro/
Mix and Match - Try to match colors by mixing light http://www.exploratorium.edu/exhibits/mix_n_match/
Afterimage experiment - try it and read the explanation http://www.exploratorium.edu/exhibits/bird_in_a_cage/bird_in_a_cage.html
Try these optical illusion(requires Shockwave) http://www.exploratorium.edu/exhibits/nf_exhibits.html
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practice the law of reflection http://www.miamisci.org/af/sln/dracula/index.html
Test yourself for color blindness http://www.toledo-bend.com/colorblind/Ishihara.asp