Most people know that if we pass light from the sun 
through a prism, we create a color 
distribution like a rainbow. 

 
This distribution of colors is called a spectrum. 
Separating light into a spectrum 
is called spectral dispersion.

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The first correct explanation of this 
phenomenon was described by the 
English mathematician and physicist Sir Isaac Newton in 1666.

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Newton, Sir Isaac
(An English mathematician and physicist)
 b-1642-12-25 in
Woolsthorpe near Colsterworth & Grantham, Lincolnshire England 
 d-1727-03-20 in
 London England and
buried in Westminster Abbey