Additive Color Mixing

This apparatus can create primary and secondary colors, and their combination with 3 filters, overhead projector, and 3 mirrors on a tall stand.

Procedure:

  • Place the plate with colored filters on the OHP and project the circles onto the mirrors so that they will make three circles on the screen.
  • Use screws on the mirrors to adjust the position of the red and blue circles. You should get white light where the three overlap.