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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Geometrical Optics
  video  - Polarization of Light
  video  - Polarization of Microwaves
 Polarization by Reflection
 Brewster's angle
 Optical Activity in Corn Syrup
 Polarization by Scattering
 The Eye

 video  - Polarization of Microwaves


Show the polarization property of microwaves.


centered image
  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 355MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 81MB size  

Hold a grid of parallel wires in a microwave beam and rotate the grid. Observe the change in transmitted microwave power in the detector. In the figure below, the source is on the left, the detector on the right.

Microwaves are linearly polarized coming out of the source along the 0-deg/180-deg mark (horizontal plane in the picture). The horizontal orientation of the metal bars blocks the microwaves such that the detector is minimum. Metal bars oriented perpendicular (vertical) to the microwave polarization (horizontal) allows them to pass such that the detector is maximum.