The two labs I completed were titled Stars, Light, and Spectra, and Young's Experiment . They both focused on the properties of light as they would pertain to stars, diffraction and interference. The overall goal was to get a good proof that light acts like a wave. Young's Experiment emphasizes the unique properties of double-slit interference.
Interference is a special property of all wave forms.
When any wave form passes throughout two properly spaced slits that are the same size as the waves' wave length, a very interesting thing happens. The two new waves cause constructive interference, an increased brightness in light, and destructive interference, the absence of light. I recreated these phenomena using a wave tank that my school had purchased for demonstrating this wave property. The picture shows me making adjustments to get the spacers at the right distance for it to work as it should. You can click on the picture to see a image taken of the projection screen.