OPTICS: LIGHT, COLOR AND THEIR USES (PDF ebook)
A great hands-on experiment & study guide from NASA filled with great color and light activities using lenses, prisms and mirrors to create telescopes, periscopes, microscopes and kaleidoscopes. Other activities include finding focal length and understanding reflection, refraction and diffraction. Activities are marked by grade level, and can be adapted from K-12 (so they say). Anyway, this is a lot of fun!
Click here to go to this resource.