6C20.15  KNIFE EDGE DIFFRACTION



  • Version 1
  • A laser beam forms a diffraction pattern at the edge of a razor blade.
  • Can be projected on to a screen or whiteboard.
  • Pattern will be visible from ~1/2 m and beyond.



  • View seen by students in darkened room.





        (put razor blade slide at ~750 mm)


  • Version 2
  • A divergent laser beam forms diffraction patterns at the edges of a razor blade.
  • Pattern will be visible from ~1/2 m and beyond.



  • View seen by students in darkened room.






        (put laser at end of optics bench, front end should be at ~380 mm)
        (make divergent beam with 18 mm lens at 440 mm, aperture at 460 mm, 252 mm lens at ~550 mm)
        (put razor blade slide at 1000 mm)

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