http://www.holoworld.com/holo/kids.html (learn about holograms and how you can make your own)
http://americanhistory.si.edu/lightproject/ (learn about the history of light)
http://www.opticalres.com/kidoptx_f.html (optics for kids)
http://www.unmuseum.mus.pa.us/mirage.htm (learn about mirages)
http://faculty.washington.edu/chudler/chvision.html (about the blind spot)
http://www.abc.net.au/science/k2/moments/s64751.htm (learn about the basics of mirrors as well as about liquid mirrors)
http://www.howstuffworks.com/question421.htm (how do one-way mirrors work)
http://www.riverdeep.net/current/2000/04/front.180400.mirrors.jhtml (reflections and images in mirrors)
http://www.truemirror.com/Moredata.asp (non-reversing true mirrors)
http://eo.ucar.edu/rainbows/ (information about rainbows)
http://www.atoptics.co.uk/bows.htm (different kinds of rainbows)
http://www.deltatech.com/rv/rainbows.html (questions and answers about rainbows)
http://www.3dglasses.net/facts_about_rainbows.htm (fun facts about rainbows)