Colours of Light

• Physics
• Secondary Education
• Age 12,13

20 April 2023

6.4 Colours of Light

Content objectives

• I can name the three primary colours of light.
• I can name the colours made when adding two or more primary colours of light.
• I can describe how filters work by subtracting light.
• I can predict what happens when different colours of light shine on different filters.
• I can explain how I see colours.

What I know:

What are the seven colours of visible white light?

Primary Colours of Light

• Can you make red light by combining two or more colours of light?

Can you make red light by combining two or more colours of light?

YES

NO

Are the primary colours of light these same as the primary colours in paints?

YES

NO

Can you add the colours of light?

YES

NO

Activity 1: Guess the colour when...

Copy this in your notebook.

• Red + Green = ______
• Red + Blue = ______
• Blue + Green =  _____
• Red + Green + Blue = ______

ophysics.com

Now, I know:

Application:

Most screens display how many colours of light?

1. 258
2. 257
3. 256

TRUE or FALSE: Changing the brightness of the primary colours makes all these different colours.

1. TRUE
2. FALSE

phet.colorado.edu

20 April 2023

6.4 Colours of Light

Can you subtract the colours of light?

YES

NO

What I know:

What can I use to separate sand from a mixture of sand and water?

Explanation:

What can I use to separate sand from a mixture of sand and water?

Can you filter the colours of light?

YES

NO

phet.colorado.edu

phet.colorado.edu

Application

20 April 2023

6.4 Colours of Light

What I know:

What colour do you see in this flower?

Explanation

What kind of object is the flower?

clue: "luminous" means giving off light

1. luminous object
2. non-luminous object

Look at these diagrams.

State one lesson that you've learned today.