To use this inquiry you will need a prism, a source of light, and a thermometer. Place the prism in the source of light until you have a clear view of the color spectrum. Record temperatures of the spectrum at the purple end, in the middle, the red end, and slightly past the red end so that there is no color on the thermometer.
The temperature should increase as you move towards and past the red side. The farther into the infared waves, the higher temperature it will produce.