Additive Colour Theory

How Different Colours of Light are Produced

Additive Colour Theory

•Different colours of light pertain to different wavelengths of light, as discussed in the electromagnetic spectrum section.• White light is composed of different colours of light.•It is possible to produce white light from the three primary colours: red , green , and blue.

Demonstrating Colour Theory•Click to turn on the blue light•When blue and red mix, majenta is produced.•When green and red are mixed, yellow is produced and when green and blue are mixed, cyan is produced.•All three colours mixed, produce white light.

QuestionOn a separate piece of paper answer the following question.

1. During a theatrical play, red and green spotlights overlap. Explain the colour audience members will see where the spotlights overlap.

Gizmo Activity

• Go to:– http://www.explorelearning.com

• Login using the username and password provided by your teacher.

• Scroll down until you find the “Additive Colour v2” Gizmo and click “Launch Gizmo”.

• Play with the different colours of light and experiment with ways of producing white light.

• Do the quiz below the Gizmo to determine how well you know Additive Colour Theory.