Lightcurves, Spectra, and Images

Try this!

You can observe the component wavelengths of light by holding a CD up to the light. A rainbow will appear.

Cut a slit in a piece of dark construction paper about 2 millimeters wide and 3 centimeters long. Hold a CD under the slit paper at about a 30 degree angle. You will see a spectrum reflected on the CD. You can point it at the Sun or a normal incandescent light, and you will see a continuous spectrum. If you point it at neon signs found in store windows, you will see the spectrum of whatever gas or gases are in the neon tubes.