6A44.35  FRUSTRATED TOTAL INTERNAL REFLECTION

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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