read about light and click for demonstrations http://www.learner.org/teacherslab/science/light/
Mix and Match - Try to match colors by mixing light Mix and Match (#4 on worksheet)
Afterimage experiment - try it and read the explanation Bird in a cage (#5 on worksheet)
Try these optical illusion(requires Shockwave) Optical Illustions from exploratorium.edu (#6 on worksheet)
Test yourself for color blindness http://www.toledo-bend.com/colorblind/Ishihara.asp
Describes properties of light and has cool interactive demonstrations Optics for Kids
Fun facts Science for Kids
You Tube video about light, written for 5th-grade http://www.youtube.com/watch?v=YCwMxaC_CHE
Lenses - convex and concave Focal Point YouTube video http://www.neok12.com/php/watch.php?v=zX78727e747d5e737a705102&t=Light-Optics
It's really for older kids, maybe middle school, but there are examples and explanations that a 5th grader can understand Optics 4 Kids
The Franklin Institute's website http://www.fi.edu/color/
Color and light - you can control the angles and see how prisms and lenses refract light Writing is for high school or adults, but animations are cool. Molecular expressions
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
Ontario Science center game - Computer crayons Computer crayons
Camouflage http://www.ontariosciencecentre.ca/scizone/games/camouflage/default.asp
lesson about lenses with a cool experiment http://janus.shc.edu.bz/in/Alberta_Rotary_TG/Student_Resources/courses/courses/elementary/science4/lessons/Module_03/S3_L13.htm
Your Eyes http://kidshealth.org/kid/htbw/eyes.html