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Light - Refraction - Colour.
A glass prism of angle
60 degrees can disperse white light
into its different colours
(called a spectrum).
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.
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.
The source of light
may also emit infra-red and ultraviolet
light.
Infra-red
light 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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Waves
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Copyright © 2007 Dr. Colin France. All Rights Reserved.