6A10.10 Blackboard Optics


Ray optics, lenses, mirrors, total internal reflection, index of refraction


The blackboard optics demo includes a ray box, various clear plastic lenses and shapes, and mirrors. It can be used to demonstrate many kinds of optics phenomena, including total internal reflection and image formation.



  • [1] Blackboard optics kit
  • [1] Ray box with power supply
  • [2] Magnetic optical mounts
  • [1] Long extension cord
  • [1] Cart or chair

Classroom Assembly

  1. Mount ray box on blackboard.
  2. Place ray box power supply on chair or cart underneath and make necessary electrical connections.
  3. Adjust rays to be parallel.
  4. Place desired optical elements on board using magnetic mounts.
  5. Unplug ray box from power supply.


  1. Dim the room lights at the front.
  2. Plug in the ray box.
  3. Adjust rays and optical elements as desired.
  4. Unplug the ray box.


Additional Resources


  • PIRA 6A10.10, 6A20.10, 6A42.10, 6A44.10, 6A60.10


  • Don't attempt this at home!

Last revised

  • 2017


Related AV

Related demos

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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.