fold mirror

English

Noun

fold mirror

  1. An mirror used to bend an optical path so that it can be made longer than the physical size of the system
    • 1978, D. G. Korsch, Anastigmatic three-mirror telescope, US Patent 4101195 , retrieved 27 December 2021, page 2:
      To achieve this, a plane mirror, which functions as a fold mirror, is positioned at an angle of 45° with respect to the image formed by the primary-secondary mirrors...
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