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Published on Mar 29, 2009
This shows Thomas Young's double slit experiment using a laser pen and a couple of pencil leads. When light shines through two slits between the leads, the two waves coming out interfere and the result is shown on the wall. Interference also occurs with one slit, because light wavelets from each side of the slit interfere with each other. The difference is that with two slits, there is an amplitude envolope not seen with a single slit. However, this is not seen in this video.