There are masses, trolleys, lenses and electronic components to assemble, experiment and take measurements with. You can swing pendulums, change gravity, change angle of ramps to learn about forces. Excellent are the optics tools which let you split light into its colours with a prism and see how fibre optics transmit light. A section on eye defects, where you increase the focal length of a spectacle lens and see what that does to the light rays will make an awesome teaching tool. Though it comes with worksheets, those with time to spare can use it to create impressive interactive tutorials.
Elementary version is on the web.
Prefer this to Crocodile Clips at age 11-15. Like BTL's CD-Rom of the same name, Wayland's Light and Sound is well tuned to school needs. Those who have been looking for something that allows pupils to swot up on science, will appreciate this one. This younger title covers the essentials of how light and sound work as well as colour, lenses, hearing and seeing. Primary pupils could access it given that the text is light and read aloud in English.