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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
 Speed of Light
 1/r2 Demonstrator
  video  - Ray Optics Kit
 Confocal Mirrors
 Concave Mirror
  video  - Light The Match
 Disappearing Beaker
 String Model of Refraction
 Total Internal Reflection
 Steal the Light
 Light Pipe and Fiber Optics
 Water Light Pipe
 Thin Lenses with Objects
 The Eye

Thin Lenses with Objects


To demonstrate the geometrical optics of thins lenses with 3D objects.


Light up 3 distinctly shaped light sources (long and tall, long and short and round) and set them up at the edge of the bench. Position the optical bench about 2 m away. Set up a lens in question in front of a ground glass screen and position a camera behind the screen. Demonstrate the usual geometrical optics things, formation of the various images, focal length of a lens, inversion of an image etc. etc.


  • 10 inch single filament lamp
  • 10 cm Lens and stand
  • 20 cm Lens and stand
  • Ground Glass Screen
  • Round Filament Lamp