Visible light can be separated

Visible light can be separated (dispersed) into the colours of the visible spectrum – red, orange, yellow, green, blue and violet. Each colour has a different wavelength and will refract different amounts to produce a
rainbow. Sir Isaac Newton discovered
this concept and popular belief has it that he
included a seventh colour for good luck, called
indigo, between blue and violet. is makes
The colour sequence easy to remember as
‘ROY-G-BIV’. is range of colours is called
the visible spectrum. e process used to
produce these colours is called dispersion.

White light can be separated into an infinite
range of different colours and shades, but there are generally considered to be six (or seven)
basic colours – red, orange, yellow, green,
blue and violet.