PIRA: 6A44.40


  • Lumirod
  • Optical fiber principle box
  • Spectra Physics 155 Laser (or small maglite can be used)
  • Include ‘internal reflection tube’


  1. Turn on the laser and direct the beam at the end of the coil. Light emerges from coil  perpendicular to the entry beam.
  2.  The straight and curved rods can be used to show how optical fibers bend a light beam to produce total internal reflection