Bispheric lens
Lens having different curvatures at the center and the edge. The different edge curvature brings the peripheral rays more closely to the same point of focus as the center rays.
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-Bispheric lens - lens having different curvatures at the center and the edge, each of which forms part of a sphere. The different edge curvature brings the peripheral rays more closely to the same point of focus as the center rays.
 See also: Lens, Focus, Overdevelop, Space, Opaque
  
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