• When two lucite bars are pressed together, a beam of light will pass through the first bar to the second.
  • Room lights must be off.










        (select good mating surfaces, press bars together and search for sweet spot with beam)

  • Typical view seen in a darkened room.




        (use video camera in large classrooms)
        (use CSM setting at ISO 400 and manual focus at .3 m)

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