A prism is a triangular piece of glass or plastic. To get it to produce a mini-rainbow, you allow a narrow strip of white light to fall on one face of the triangle, like this: (See this page for a neat java applet that demonstrates the dispersion of a prism.)
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A prism is a triangular piece of glass or plastic. To get it to produce a mini-rainbow, you allow a narrow strip of white light to fall on one face of the triangle, like this: (See this page for a neat java applet that demonstrates the dispersion of a prism.)