Control of Vision
The Processing of Color
used to be thought that white light is equal to purity. When Newton came
along in 1672 and proved that white light is a mixture of colored lights,
he created a great fury as it went contrary to the beliefs of the times.
Goethe, the German poet, was outraged and attacked Newton viciously. The
well-known experiment of Newton's appears in Figure
42. The prism breaks down the light from the sun into the
components of the rainbow, but when a narrow ray of light is passed through
another prism there is no further breakdown.