principal section
noun
1
: a plane passing through the optical axis of a crystal
specifically
: the principal plane that contains either the wave normal or the ray of light under discussion
2
: a plane perpendicular to the edge of an optical prism
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“Principal section.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/principal%20section. Accessed 26 Nov. 2024.
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