optic axis

Noun
  1. In a doubly refracting crystal, the line in the direction of which no double refraction occurs (synset 106019730)
    "a crystal may have either one or two optic axes"
    is a type of: axis - a straight line through a body or figure that satisfies certain conditions
  2. A line that passes through the center of curvature of a lens so that light is neither reflected nor refracted (synset 106019454)
    "in a normal eye the optic axis is the direction in which objects are seen most distinctly"
    is a type of: axis - a straight line through a body or figure that satisfies certain conditions
    same as: principal axis

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