Materials

For this list, many of the materials can be interchanged and varied at the whim of your scientific mind(which is one of the coolest ways to do it.) But you will definitely need:

• A clear gelatin mold
• At least two protractors
• Some way to be sure you're shooting the beam correctly
• Math
• A working knowledge of Snell's law.
• A class II or III meteorologic neon laser (take extra precautions to avoid direct retina exposures with the lasers.)

The way I actually guided my laser was by crimping a metal cable to the cut 2X4 that the laser was resting on to the board that the gelatin would rest on. This made sure to always shoot at the same focal angle so that the refracted angle did not change.