Georgia State University
Georgia State University: Hyper Physics: Atmospheric Optics Concepts
This physics department site features an indexing page for a variety of pages pertaining to atmospheric optics. Topics include rainbows, halos, auroras, mirages, star twinkling, sunsets, green flashes, coronas, and more. Excellent...
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,...
Other
Gcse: Refraction
Informational site contains a mini tutorial on refraction as well as provides colorful illustrations to aide in learning.
Other
Ntnu Virtual Physics Lab: Thick Lens Java Applet
An interactive Java applet which allows the user to investigate the path of light through a lens shape object. The shape of the object, the index of refraction of the material, and the location of the incident rays can be altered.
Boston University
Bu: Optics: Geometric Optics
Several short descriptions of demonstrations which illustrate principles of geometric optics (many of which focus upon refraction).