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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  - Interference and Diffraction
 Multiple Slit Interference
 Multiple Slit Interference II
 Diffraction using CD
  video  - Newton's Rings
 Laser Interference
  video  - Thin Film Interference
 Michelson Interferometer
 The Eye

Laser Interference


To demonstrate the interference of the laser beam light


Point the green laser beam onto the double layered microscope slide and reflect it onto the screen. Dark interference lines formed by the light reflected off of front and back surfaces of the double slide can be seen quite clearly. This takes a little practice to get an image that the whole class can view.


One may use a divergent lens in front of the reflected light to expand the pattern on the screen for better view. Also demonstrate that the original beam spot does not have the same structure.


  • Microscope slide
  • Uniphase Green Laser