Excerpt from Design: An Introduction
Here is the source of all color-vision, in the so-called white light of the sun. This continuous gradation of the spectral colors can be seen whenever a beam of sunlight is dispersed by means of a glass prism or a shower of water drops. The different wave lengths of light are thus separated and the rainbow colors show themselves.
Objects are visible to us because of the characteristic ways they reflect or transmit, to our eyes, various of the component rays of the spectrum.
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