This is an extremely cheap laser diffraction grating which can be used, along with an ordinary laser pointer, to conduct the double-slit experiment and demonstrate the wave/particle duality of light. See http://en.wikipedia.org/wiki/Double-slit_experiment for further details on this experiment.
DiffGrating_25_Frame.SLDPRT | 306.0KB | |
DiffGrating_25_Frame.STL | 44.8KB | |
DiffGrating_50.STL | 23.9KB |