6D20.15-Diffraction gratings and Laser

6d2015diffraction gratings and laser-2 6d2015-1diffraction gratings and laser

Description: This demonstration shows what happens to laser light that passes through a diffraction grating.


  • Optical bench
  • Laser on post
  • Magnetic stand and magnetic slide holder
  • Diffraction grating slide

Setup Procedure:

  1. Insert the laser into the optical bench.
  2. Insert the magnetic stand into the optical bench.
  3. Place the diffraction grating on the magnetic slide holder.
  4. Place the magnetic slide holder onto the magnetic stand and align so the laser will shin on the grating.
  5. Setup in the classroom so the diffraction pattern fits on the screen.

Demonstration Procedure:

  1. Turn on the laser and make sure it’s lined up on the grating.
  2. (Optional) Turn off the lights.
  3. Note the diffraction pattern on the screen.
  4. You may repeat this using a different grating.
  5. When finished, turn off the laser.

Caution, Laser Laser Light
Do not stare into the beam. Keep away from students eyes.