Other
Corning Optical Fibers
Corning serves as a leader in optical fiber technology and this website provides information about the uses of optical fibers in medical imaging, communication, etc., as well as industry news and related resources.
Georgia State University
Georgia State University: Hyper Physics: Fiber Optics
This physics department site provides a discussion and explanation of fiber optics and fiber optic imaging.
Boston University
Bu: Optics: Geometric Optics
Several short descriptions of demonstrations which illustrate principles of geometric optics (many of which focus upon refraction).