This website from the Exploratorium provides an activity on building a Zoetrope, a device that produces an illusion of action from a rapid succession of still pictures. The site contains written instructions and video...

This activity demonstrates how white light, such as that from an overhead projector, is broken up into its component colors by a diffraction grating. Students will learn the relationships between light's wavelength,...

This is the Chandra X-ray Observatory photo album website. It begins with an introduction on the electromagnetic spectrum, focusing on X-rays in particular. It also contains information on false color images. The images...

This website from eChalk contains optical illusions offering proof that our color perception is strongly influenced by surrounding colors. The site also includes educational games related to optical illusions and color.

This site contains various applets and animations of physical processes, demonstrating various ideas in waves, optics, mechanics, and thermodynamics. The site also contains information on the theory behind diffraction...