Georgia State University
Georgia State University: Hyper Physics: Diffraction
This physics department site provides links about the diffraction of light. Each page includes thorough explanations and meaningful graphics. Some pages include interactive problem-solving practice sections.
Other
University of Tennessee Knoxville: Diffraction and Interference
Explains what diffraction and interference are, and what kinds of patterns are produced when light waves pass through a single slit, a double slit, or a diffraction grating. Includes three problems for students to try, with solutions...
Boston University
Bu: Optics Demonstrations: Diffraction
Short descriptions and graphics of three demonstrations which illustrate the diffraction phenomenon. Suitable as a supplement for a teacher lesson plan or as an idea-generator for a student project.