optic axis

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English[edit]

Noun[edit]

optic axis (plural optic axes)

  1. The optical axis. [from 17th c.]
    • 1665, Robert Hooke, Micrographia, section XXXIX:
      [B]inocular creatures can in an instant […] move their eyes so as to direct the optick Axis to any point […].
  2. (crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction. [from 19th c.]
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