iKnowthat.com has multimedia educational games for kids ages 2-12.

Optics Workbench Activity

In this activity, kids learn all about light and the properties of mirrors, lenses, and prisms.  The workbench is stocked with light sources of different colors.  There are also a variety of shapes that can be set to be opaque or transparent.  These shapes are flat, convex, concave and multi-sided.

Kids can experiment with different combinations of light sources and objects.  They can figure out how to bounce and bend light (reflection and refraction).  Kids can also make color spectrums from white light that is passed through a prism.

Kids can save their projects at the site.  And they can show their optics science projects to family and friends through email invitations.