An experiment using Jell-O to create lenses, to see how light behaves with flat, concave, and convex lens surfaces. With an explanation of what is observed, and a link to an informative article on lenses.

Understand how lens curvature, focal length and f-stop are related.

This site provides a basic experiment that shows how a lens works. This lesson plan explains nearsightedness and farsightedness. It also explains concave and convex lenses.

This lesson will describe what a lens is and how a lens works.

The invention of the telescope helped change our understanding of the universe. This video segment adapted from NOVA looks at Galileo's contribution to this technology. [1:49]

[Free Registration/Login Required] This flipchart reviews the characteristics of light and its properties. Students are given examples of reflection, refraction, and lens types. An assessment component is included.

[Free Registration/Login Required] Learn about the type, size, location, and orientation of the image that forms when a thin lens is used to view an object using this interactive simulation. A PDF worksheet and a video tutorial are also...

This is a 10-question quiz about thin lenses.

Site describes how to construct a telescope and what you can do with it. Also provides a simple explanation of how telescopes work.

Provides a discussion of curved mirrors and ray diagrams. Shows and explains the process of drawing a ray diagram to determine the image location, size, and orientation.

Students use this tutorial to investigate the refractive ability of converging and diverging lenses.

This site provides a very brief definition to geometric optics, and includes links to related information.