This simple piece of glass is a powerful tool for examining the electromagnetic spectrum. As light enters a prism, it changes speed going from one medium into another (air into glass). Since every color is made of photons vibrating at unique frequencies, they bounce off the glass walls at unique angles. This causes white light to fan out into the full color spectrum producing a rainbow effect. Isaac Newton discovered this effect when he was 23 and began giving lectures on his theory of colour at 27.
6" x 1" x 1" equilateral triangular prism
Made of high-clarity lab-grade glass for the best effect.
Will break if dropped, but the surface is scratch resistant.
Rainbows in the sky are produced in the same way; all the water droplets/vapor in the air are acting as tiny prisms. To produce a rainbow, use a small, bright source of white light—like the flashlight on a phone—in a dark room. Adjust the distance of light and rotate the prism until the light spectrum refracts.