- The Geometry -

The double-slit experiment is the strangest phenomenon in physics. Transcript 0:00 The double-slit experiment  defies our understanding. 0:03 It involves a laser shooting beams  of light particles, called photons,   0:07 at a screen with two parallel slits. 0:10 If we mark all the spots where  the photons hit the second wall,   0:13 we should expect to see two strips  to correspond with the two slits. 0:17 But that’s not what we see. 0:19 Instead, we see an alternating  pattern of light and dark bands. 0:23 This is characteristic of the behavior of waves  that pass through both slits simultaneously,   0:29 interfering with each other to create  the pattern on the second screen. 0:32 The bright lines are where the top of waves  meet, resulting in a more intense or brighter   0:38 area on the screen. The darker bands are where  the top of one wave meets the bottom of another,   0:43 so they cancel each other out, resulting in  a less intense or darker area on the screen. 0:48 Here is a p