Engaging questions:

  • How are colours on the TV set created?
  • What are the base colours?
  • How are complementary colours formed?
  • What is the mechanism of the human eye action?
  • What colours can the human eye perceive?
  • What is the RGB scale?


Equipment: flashlights, filters: green, blue, red (they can be made of tinted film).

Description of the Activity :

Students put filters on the torches, and then watch the colour of light on a white sheet of paper. Then, they illuminate the same spot using two torches.


  • What is the colour of light that will be formed as a result of superposition of light from all 3 torches?
  • What is the colour of light that will be a result of putting on a torch 2 different filters?