Reviewed: one independent reader; copy check clear.

focal length

focal length Focal length is the distance that characterizes a lens’s focusing action and determines its optical power.

Focal length is the distance that characterizes a lens’s focusing action and determines its optical power. In this historical source, optical power is described as the reciprocal of focal length, so a shorter focal length means greater power.

Also see

Sources

Drafting source: Baldwin, Dictionary of Philosophy and Psychology, volume II. 1902 original US edition; OCR SHA-256 b86b5dbbaa0a0b3ecf6c8b0a089a7ca5409b9bac4e6481cba91c99bba16f31bd. “Baldwin, Dictionary of Philosophy and Psychology, volume II” (philopsych02balduoft:chars-4378500-4390500).
public-domain-US · Definition uses new wording; original source retains its stated licence. · Source snapshot SHA-256: b86b5dbbaa0a0b3ecf6c8b0a089a7ca5409b9bac4e6481cba91c99bba16f31bd

These citations identify the drafting sources. 1/2 independent reader passes against the pinned source packet. The drafter does not count as a reader. Source institutions do not endorse this dictionary.

Cite this entry

PsychTerms (psychterms.org), CC BY 4.0, version 1. “focal length.” Development preview.

Version 1 · SHA-256: e011d3fbf154a438a031b2d9c9e66a1aa6f9120c13e3949ddc0705c06f920caa

Edit this entry on GitHub