Exploratorium
Exploratorium: Online Exhibit: Mix and Match
A Shockwave movie which allows users to mix varying colors of light and observe the effect upon the appearance of a circle. Accompanied by a "To Do and Notice" section and a "What's Going On?" section. Excellent!
Georgia State University
Georgia State University: Hyper Physics: Color Vision Concepts
An indexing page from Georgia State University for a variety of other pages associated with color vision. Pages are filled with meaningful graphics and thorough explanations.
University of Colorado
University of Colorado: Physics 2000: Temperature and Absolute Zero
A thorough, multipage discussion of color and color television sets that explains how an image is formed on the television using red, green, and blue light. Understandable discussion, excellent graphics, and many interactive Java applets.
Physics Classroom
The Physics Classroom: Light Absorption, Reflection and Transmission
This tutorial explains light absorption, reflection and transmission in a clear and concise manner. Provides a "Check Your Understanding" section as well as additional links on color and light.