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The double-slit experiment defies our understanding. It involves a laser shooting beams of light particles, called photons, at a screen with two parallel slits. If we mark all the spots where the photons hit the second wall, we should expect to see two strips to correspond with the two slits. But thats not what we see. Instead, we see an alternating pattern of light and dark bands. This is characteristic of the behavior of waves that pass through both slits simultaneously, interfering with each other to create the pattern on the second screen. The bright lines are where the top of waves meet, resulting in a more intense or brighter area on the screen. The darker bands are where the top of one wave meets the bottom of another, so they cancel each other out, resulting in a less intense or darker area on the screen. Here is a photo of a real interference pattern. The original double-slit experiment was conducted in 1801 by British polymath Thomas Young. Since then, i
