CK-12 Foundation
Ck 12: Physical Science: Optical Instruments
[Free Registration/Login may be required to access all resource tools.] What optics are and different types, and how they work and form images.
CK-12 Foundation
Ck 12: Physics: Geometric Optics Study Guide
Learn and understand geometric optics with this review resource.
Boston University
Bu: Optics: Geometric Optics
Several short descriptions of demonstrations which illustrate principles of geometric optics (many of which focus upon refraction).
Other
United States Master Swimming: Fiber Aquatics
The principle of total internal reflection is discussed in this article. The appearance of objects from inside the water of a swimming pool is compared to the path of light in a fiber optic cable.
Other
Webopedia: Fiber Optics
This resource provides a basic definition of fiber optics including a drawing, and it also tells some advantages of using fiber optic cables instead of metal.
Optical Society
Optical Society of America: Optics for Kids: Guiding Light Optical Fiber
This experiment demonstrates the concept of total internal reflection, using basic materials. Accompanied by a detailed explanation of what's happening, and links to articles on reflection and refraction.
Optical Society
Optical Society of America: Optics for Kids: Make a Light Fountain
A simple experiment that demonstrates the concept of total internal reflection, and shows how light can travel around curves and corners, as it does in fiber-optic cables. Accompanied by an explanation of what's happening.