University of Minnesota
University of Minnesota: Refraction of Light
This page is a continuation of a tutorial about light reflection and refraction. It contains a diagram and suggestions on how to derive Snell's Law, which governs the refraction of light in a medium. For background to this derivation,...
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.
Other
Weather Photography
Source of information on the subject of weather photography. There are great links, images and tips on equipment to use. For the intermediate to advanced photographer.
Curated OER
Weather Dude: Rainbows
Informational site allows users to discover what makes a rainbow. Discover how they form and learn some interesting facts about them along the way.
Other
All About vision.com: Eye Conditions and Diseases
Many articles with consumer information about lenses, eyewear, eye problems, and unique eye conditions. Vast content and many links to off-site information.
Other
Gem Hut: Zircon
This commercial page gives information about the physical properties of zircon, its appearance, and where it can be found. Includes pictures and tables.