Optical Society
Optical Society of America: Optics for Kids: Lose a Glass in a Glass
This is an activity that should only be done outdoors or in a well-ventilated area, with adult supervision, as it involves paint thinner. It demonstrates the concept of the index of refraction for different materials, in this case that...
Optical Society
Optical Society of America: Optics for Kids: Total Internal Reflection
An investigation into the total internal reflection of light, using a laser pointer. Accompanied by an explanation of what's happening, a discussion of Snell's Law, and links to additional information.