• A laser beam can be diffracted by one of four double slits.
  • The resulting interference pattern can be projected on a wall or white board.
  • Room lights must be off.
  • Slit slide has 4 different slit pairs:
    • .04 mm width @ 0.25 mm spacing
    • .04 mm width @ 0.50 mm spacing
    • .08 mm width @ 0.25 mm spacing
    • .08 mm width @ 0.50 mm spacing

         (Randy Babbitt variation: cm markings on a meter stick will be illuminated
         when it is 4 m from a slit with 0.25 mm spacing.)


  • Typical slit pattern seen in a darkened room.

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