Georgia State University
Georgia State University: Hyper Physics: Microscope
This site from Georgia State University Physics Department provides a discussion of how light refracts through the lenses of a microscope. Demonstrates the parts of a microscope and includes an interactive form in which the magnifying...
Florida State University
Florida State University: Microscopy Primer: Anatomy of the Microscope
The premier web site on the physics of microscopy. Includes several pages and numerous Java applets about microscopes and refraction. Thorough, well-illustrated, interactive, fun, and educational. What more can one ask for?
Soft Schools
Soft Schools: Science Games: The Parts of the Microscope
Look closely and see if you can identify the various parts of the microscope.
Other
Science Hobbyist: Making Telescopes
Site describes how to construct a telescope and what you can do with it. Also provides a simple explanation of how telescopes work.