Open in the curiosity app
Share the knowledge!

Light in the Shadows: the Poisson Spot

Key Facts In This Video

  1. If you shine a light on a perfectly spherical object, you will see a bright dot in the middle of its shadow. 00:33

  2. See an example of a Poisson spot: 05:24

  3. To see a Poisson spot, you need a coherent light source, which is why the spots don't commonly appear in everyday life. 07:04