Lesson Notes By Weeks and Term - Primary 6

Components of light

Week 3

Duration: 40 mins

Reference: Smart basic science and technology (Basic Technology)

Objective: At the end of the lesson pupils should know primary and secondary colours.

Topic: Components of light


Light is all around us and is made up of different colours. Light helps us to see. The sun is our most important source of light. Without the sun, there would be no light, and no life on earth would be possible. We see light with our eyes. Sunlight looks white, but it is made up of a band of seven colours. A rainbow is a spectrum in the sky made by sun light shining onto raindrops. The rays of sun are bent by the raindrops and so we can see the different colours. Red, orange, yellow, green, blue, indigo, violet, these are the seven colours of the rainbow.

Primary and secondary colours

All the colours in the rainbows can be made from mixture of three coloured lights. These three colours are the most important colours and they are called primary colours. The primary colours of light are red, green and blue. They can be mixed to make any other colour. When you mix the three colours together, you get white light.

Secondary colours

If you mix red and blue paint together, you will get purple. Blue and yellow gives you green. Yellow and red gives you orange. Purple, green an orange are called the secondary colours of paint.

Complementary colours

Red and green lie opposite each other on the colour wheel. These are called complementary colours. The other complementary colours are purple and yellow, and blue and orange.

Mixing colours

We can mix colours to get secondary colours. We can vary secondary colours by mixing different amount of the primary colours. We can make a colour lighter or darker by adding white or black paint. Adding black is called shading. Adding white is called tinting.


Step I: Teacher introduces and explains new topic to pupils

Step II: Pupils are allowed to ask questions

Step III: Teacher writes notes on the board for pupils


  1. Explain primary and secondary colours
  2. Explain complementary colours

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