6A20.10: Blackboard optics - curved mirrors
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
- Connect the power adapter to the laser.
- Remember to collect the laser off the blackboard (common mistake!)
- Place the laser on the board.
- Attach the Curved mirror to the blackboard clamp.
- Position the mirror on the black board facing the laser with the convex side showing (see first picture).
- Turn on the laser (press in and over).
- Note how the laser beams reflect off the mirror. The focal point is virtual and not shown on the board.
- Rotate the mirror to have the concave side facing the laser (see second picture).
- Note how the laser beams reflect off the mirror. The focal point is now clearly visible and is real.
- When finished, turn off the laser (press over and out).
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.