Spherical lens

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Spherical lens
Posting date : Nov 13, 2006
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HS-CODE
90-
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Detailed Description
Symmetric concave lenses are manufactured with both concave surfaces. They have negative focal lengths. These lenses are often used to expand light or to increase focal lengths in existing systems. Also, they can be used in laser beam expander, optical character readers, viewers, and projection systems.

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