Other
Vmc: What Is Light?
What is light? A detailed examination of what creates light, light spectrums, scientists' discoveries, and colored graphics. Appropriate for the older student or adult researcher.
University Corporation for Atmospheric Research
Ucar: About Rainbows
This site from the University Corporation of Atmospheric Research provides an illustrated article about the phenomenon of rainbows.
York University
York University: Color and Color Vision
York University provides an index page to several other pages on the topic of color and color vision. The pages are part of an online "book." Many graphics and explanations.