To create a spectrum using water.
To create a spectrum using water using a beam of light passing through water to form rainbow colors on the ceiling. Place a mirror in a shallow bowl of water bowl so that it is at an angle of about 30 degrees to the surface of the water. Make the room dark, and then shine the torch on the mirror. A small spectrum of colors will appear on the ceiling. The experiment shows that white light is composed of many different wave lengths, each belonging to a different color of the spectrum. The water acts as a simple prism, thereby refracting each wave length of light at a different angles to form the colors of the spectrum.