- Prepare Jell-O according to instructions
- Pour about half an inch of the red Jell-O into one petri dish and half an inch of the blue Jell-O in the other.
- Hold the red laser flat against the table and shine it into the Jell-O. Does the light pass through it or not?
- Do the same thing but with the green laser. Again, does it shine right through or not?