6A44.40-Laser and Fiber Optics

6a4440laser and fiber optics

Description: These fiber optic devices show how we can exploit total internal reflection to transfer light across
great distances, and even in non linear paths.


  • Laser
  • Fiber Optic cable
  • Curled glass tube
  • Fiber Optic toy

Setup Procedure:

  1. Make sure the fiber optic toy works.

Demonstration Procedure:

  1. Turn on the laser and shine it into the curled glass tube. Note that you can see the laser light out of the other end.
  2. Shine the laser into the fiber optic cable. Note that you can see the laser light at the other end, even if you bend the cable a little.
  3. The fiber optic cable can also be used to read text off a paper.
  4. Show the Fiber Optic toy. Turn it on.
  5. When finished, turn off the toy and the laser

Laser Light Laser Light
Do not stare at the laser beam. Do not point the laser at students.