Georgia State University
Georgia State University: Hyper Physics: Scattering Concepts
A collection of several pages explaining the principles which underlie Rayleigh scattering of light.
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: Characterizing Color
This site from Georgia State University discusses the meaning of the terms hue, saturation and brightness. Thorough, meaningful explanations and outstanding graphics.
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.
Physics Classroom
The Physics Classroom: Blue Skies and Red Sunsets
This high school resource shows how the blue of the skies and the red of the sunsets can be explained by the interaction of sunlight with atmospheric particles which causes scattering of light.
Physics Classroom
The Physics Classroom: The Electromagnetic and Visible Spectra
A tutorial on the electromagnetic and visible spectra. Discusses dispersion and how perceptions of white and black are related to the visible light spectrum.
Physics Classroom
The Physics Classroom: Light Waves/color: Electromagnetic and Visible Spectra
This illustrated physics tutorial explains the electromagnetic and visible spectra of light using illustrated examples and interactive practice problems.
Physics Classroom
The Physics Classroom: Refraction and the Ray Model of Light: Rainbow Formation
Understand the physics behind Roy G. Biv, and how rainbows are formed by drawing upon our understanding of refraction, internal reflection, and dispersion.
Synopsys
Synopsys: A Gentle Intro to Optical Design: Why Is the Sky Blue?
Discusses Rayleigh scattering in plain language and attributes the blueness of the skies to this phenomenon. Discussion of scattering is just one topic of many on this lengthy page of optical topics.