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objectives
objectives
Dispersion
Dispersion
A prism splits a ray of white light into the colours of the rainbow.
This process is known as dispersion.
The colours that make up white light are called the spectrum. The order of the colours in the spectrum is always the same.
Use this phrase to remember the order of colours:
Colours and Wavelength
Colours and Wavelength
As you can see here - each colour has a slight difference in wavelength between 400 - 700 nm. With longer wavelengths being Red and shorter wavelengths being Blue/Violet
Primary and Secondary Colours
Primary and Secondary Colours
- The three primary colours of light (red, green and blue) can be mixed in different amounts to make all other colours.
- The colours made by mixing two primary colours are called the secondary colours – magenta, yellow and cyan.
Seeing Different Colours
Seeing Different Colours
How do we see the different colours in the frogs skin?
Red
This skin absorbs all colours except red and so is seen as red.
Black
This skin absorbs all colours.
No colours are reflected and so it appears black.
How do we see the different colours in this flower?
Yellow
This part absorbs all colours except red and green.
It reflects red and green light, and so appears yellow.
White
This part absorbs no colours.
It reflects all the colours and so appears white.
Using Filters of Primary Colours
Using Filters of Primary Colours
- A filter absorbs some colours of white light and lets other colours through to create coloured light.
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