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Chapter – 27
Electromagnetic radiation – energy carried through space in the form of
What is Light?
• electromagnetic radiation with wavelengths
between 400 nm and 700 nm that stimulates
the retina of your eye.
• Nm = 1 x 10-9 m - 0.000000001 m
• How fast light travels is dependent of the
median in which it travels through.
• speed of light in a vacuum = 3.0 x 108 m/s..
– (186 thousand miles per second) -
Visible light is a collection of all the colors of the rainbow
(R.O.Y.G.B.I.V.), which together make white light.
• Each color has its own wavelength and frequency but they all travel at
the same speed (until they hit a medium).
• Color by addition
• Primary colors – red, green and blue (together make
• Primary colors can be mixed together to form
secondary colors
• Secondary colors
Red and green = yellow
Blue and green = cyan
Red and blue = magenta