6A20.10-Blackboard optics – curved mirrors

6a2010blackboard optics curved mirror-2 6a2010blackboard optics curved mirrors-1

Description: Using the convex and concave mirrors in the blackboard optics set, you can show how light is reflected.
A discussion on focal points, radius of curvature, and virtual and real images can accompany this demonstration.


  • Blackboard optics laser
  • Laser power adapter
  • Curved mirror and blackboard clamp
  • Clay

Setup procedure:

  1. Connect the power adapter to the laser.
  2. Remember to collect the laser off the blackboard (common mistake!)

Demonstration Procedure:

  1. Place the laser on the board.
  2. Attach the Curved mirror to the blackboard clamp.
  3. Position the mirror on the black board facing the laser with the convex side showing (see first picture).
  4. Turn on the laser (press in and over).
  5. Note how the laser beams reflect off the mirror. The focal point is virtual and not shown on the board.
  6. Rotate the mirror to have the concave side facing the laser (see second picture).
  7. Note how the laser beams reflect off the mirror. The focal point is now clearly visible and is real.
  8. When finished, turn off the laser (press over and out).

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

Note: It works best if you have chalk on the chalk board. This will make it eaiser for the class to see the laser beam.