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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
 Additive Color Mixing
 Line (discontinuous) Spectra
 Rainbow II
  video  - Sunset
 The Eye

Line (discontinuous) Spectra


To observe the different spectra of ionized gases such as Hydrogen, Deuterium, Helium, Nitrogen, Iodine and Mercury.


There are two options:
1) A diffraction grating can be taped on the lens of a video camera and the line spectra can be displayed on a projector screen.
2) We have many individual gratings that can be passed out to the class and have the students observe the line spectra by themselves.

The different gas tubes are easily changed and the spectra are quite beautiful. The gratings can also be rotated to show some recombination of the separated colors.


  • Spectrum Tube Power Supply
  • Diffraction Gratings
  • Sodium Lamp
  • Spectrum Tubes