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The Refraction of White Light to Produce Colours.

What is a Spectrum?

The dispersing of light or other electromagnetic radiation
into its component parts produces a spectrum.
A glass prism of angle 60 degrees can disperse
white light into its different colours. See the picture below.

What are the Colours of the Spectrum of White Light?

The seven colours of light are
Red, Orange, Yellow, Green, Blue, Indigo and violet.
You can remember the colours and order by remembering
Richard of York gave battle in vain.

The different colours of light have each
a different frequency and wavelength.
The different colours are refracted by different amounts.

Red light has the longest wavelength and is refracted least.
Violet light has the shortest wavelength and is refracted most.

Light passing through a Prism showing the Spectrum of Colours

The source of light may also emit infra-red and ultraviolet light.

Infra-red is heat radiation with a longer wavelength than red light.
A thermometer placed at IR will show a rise in temperature.

Ultraviolet light has a shorter wavelength than violet light.
A fluorescent material will glow when placed at UV.

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