This webpage, from HyperPhysics at Georgia State University, contains an introduction to the Fresnel lens, a design that vastly reduces the amount of glass required for large lenses. The lens is described and diagrams...

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.

Refraction is an important behavior of light that can be used to explain the operation of lenses, prisms, and optical fiber, as well as natural phenomena such as rainbows and mirages. The index of refraction, or...

In this video from the ICT Center, learn about the index of refraction and Snell’s law. Review a simple example of refraction, the speed of light in materials, and the formula for calculating the index of refraction....

This exercise, presented by the National Nanotechnology Infrastructure Network, covers the concept of nanobacteria. In this lesson, students will "calculate surface area, draw graphs, and approximate the populations of ...