Bi-concave lens
A simple lens or lens shape within a compound lens, whose surfaces curve toward the optical center. Such a lens causes light rays to diverge.
-Concave lens - see Bi-concave lens.
-Condenser - optical system which concentrates light rays from a wide source into a narrow beam. Condensers are used in spotlights and enlargers.
 See also: Plate, Compound lens, Concave lens, Cassette, Development
  
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