Poisson Spot

From UO Physics Demonstration Catalog

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Poisson Spot.gif

Description:

A laser beam with a beam expander attatchment is aimed at the ball bearing which is held by the lens apparatus. The interference pattern, which is now large enough to see clearly, is projected onto a screen or wall. The bright spot at the center of the pattern, Poisson's spot, is the result of light waves being bent around the ball bearing.

A video camera will be required to show the spot in a classroom

Location:

  • Laser: Shelf M-2
  • Lens/Ball Bearing Holder: Shelf M-3