WordReference Random House Unabridged Dictionary of American English © 2025
prin′cipal plane′, [Optics.]
  1. Opticsa plane that is perpendicular to the axis of a lens, mirror, or other optical system and at which rays diverging from a focal point are deviated parallel to the axis or at which rays parallel to the axis are deviated to converge to a focal point.

'principal plane' also found in these entries (note: many are not synonyms or translations):
extraordinary ray - focal length - focal plane - principal point

Forum discussions with the word(s) "principal plane" in the title:


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