This collection, created and maintained by Harald Edens, contains photographs of many different atmospheric optical phenomena. Those phenomena include ice crystal halos, light scattering, and atmospheric refraction,...

This Exploratorium site contains an activity about afterimages, the lingering images seen after staring at a particular stimulus. Participants look at bird shapes of different colors for a while and then look away,...

This Exploratorium site contains an activity to produce images with a cylindrical mirror. The mirror is made of aluminized Mylar backed with construction paper. The site provides diagrams to explain the observed...

This Exploratorium activity shows how small, fuzzy objects can disappear from view in the absence of eye movement. The site contains instructions for the activity, an explanation of the change in perception, and...

This site, hosted by How Stuff Works.com, explains the science behind rainbows, including the bending and refraction of light. Using images and text, the site explains the process step by step, making it very accessible.