focal plane

Fetched 2026-10-26 (cache).

Synonyms: focal planes, focal line, nodal plane

Antonyms: focal planes, focal line, nodal plane

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|optics}} Any plane [[perpendicular]] to the [[axis]] of a [[lens]] or [[mirror]].
2. {{lb|en|optics}} Such a plane, in a [[camera]], [[microscope]] etc, in which the [[real image]] is in [[focus]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.