Learn about properties of light via java applets.  You will have a fun learning experience.

Java Applets:  For the following to work you must have a Java supporting browser.
Lenses  Demonstrates how light travels through a series of lenses.
Diffraction Shows effect of diffraction on a wave front moving through a diffraction grating.
Reflection Explains how light is reflected inside a parabolic mirror.
Camera Describes a pinhole camera and how it works.
Refraction Observe how light changes paths when it encounters a different propogation medium.