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Photonics Dictionary

cleared out

Denoting a finished circular edge. A decentered lens is adjusted on a centering chuck so that its image runs true, and the lens is then edged. A circular edge is one that has been cleared out. However, if the decentering is excessive and the lens is edged down to its given diameter, there can be an edge section that never touches the grinding wheel. The finished lens will not have a circular outline; it is not cleared out.
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