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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

 video  - Newton's Rings


To demonstrate an interference pattern fomed by the reflection from a thin air gap formed by two glass pieces.


centered image

Place a lightbox at 45-degrees to the Newton's Rings apparatus front surface. Then, aim a camera at 45-degrees to the glass surface. The spacings can be adjusted by the thumbscrews on the bottom of the device. Gently pinch the apparatus with the fingers and observe the shifting pattern.


The apparatus is too small to view from the lecture bench. So, if one does not have access to a camera to project the demo to the class, then, instead, pass around the Newton's Rings apparatus so the students can see it in their own hands.


  • Newton Rings Apparatus