Prisms

There's optical science and high school physics, and then there's making pretty colors with this little 4-1/2" x about 1" equilateral acrylic prism. It makes the same rainbows that the beveled edges on the glass in the French doors to your grandmother's...

Polished glass equilateral prisms. Equilateral because each edge of the end is the same length. Thus, as all you geometry students know, each of the angles is also the same, 60 degrees. These are school grade and are fine for...