focal plane

noun

Any plane perpendicular to the axis of a lens or mirror.

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Meanings

nounfocal plane (plural focal planes)

plural focal planes

  1. engineeringAny plane perpendicular to the axis of a lens or mirror.
  2. engineeringSuch a plane, in a camera, microscope etc, in which the real image is in focus.
Cite this entry
APA

focal plane. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/focal%20plane

MLA

“focal plane.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/focal%20plane. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “focal plane,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/focal%20plane.

Source: focal plane on Wiktionary, CC BY-SA 4.0.