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principal axis

3 ENTRIES FOUND:
  1. principal axis (noun)
  2. principal plane (noun)
  3. principal point (noun)

prin·ci·pal axis

noun \ˈprin(t)-sə-pəl-\

Definition of PRINCIPAL AXIS

: the line with respect to which a spherical mirror or lens system is symmetrical and which passes through both the center of the surfaces and their centers of curvature

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