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The
controlled bending of light rays is what optical design is all about. Optical
designers have infinite ways to curve the sides of glass and plastic and
thereby create lenses. But there are only two basic types of lenses...
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Positive
lenses... which are always thick in the middle and thin at the edge. They come
in different shapes but are always thick in the middle and thin at the edge.
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and...
Negative lenses... are always thin in the middle and thick at the edge.
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Positive
lenses converge light rays. |
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Negative
lenses diverge light rays. |
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