optic axis definition

  • noun:
    • An optical course through a crystal along which a ray of light can pass without undergoing double refraction.
    • the straight-line passing through center associated with student, and perpendicular towards area associated with eye.
    • a line that passes through the center of curvature of a lens to make certain that light is neither shown nor refracted
    • in a doubly refracting crystal, the range toward which no dual refraction takes place
  • adjective:
    • The line in a doubly refracting crystal, in the direction of which no dual refraction does occur. A uniaxial crystal has actually one line, a biaxial crystal has two.

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