[Illustration: FIG. 87.--Rainbow colors recombined to form white
light.]
White light is not a simple light, but is composed of all the colors
which appear in the rainbow.
129. Color. If a piece of red glass is held in the path of the
colored beam of light formed as in Section 127, all the colors on the
wall will disappear except the red, and instead of a beautiful
spectrum of all colors there will be seen the red color alone. The red
glass does not allow the passage through it of any light except red
light; all other colors are absorbed by the red glass and do not reach
the eye. Only the red ray passes through the red glass, reaches the
eye, and produces a sensation of color.
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