principal plane

noun Optics.
a 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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To principal plane
Explore Dictionary.com
Previous Definition: principal parts
Next Definition: principal point
Words Near: principal plane
More from Thesaurus.com
Synonyms and Antonyms for principal plane
More from Reference.com
Search for articles containing principal plane
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
The height is measured from the floor to the principal plane of the ceiling.
The shortest distance from a clear pixel to a cloud in the principal plane is defined as cloud-free distance for the clear pixel.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature