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focal length

measure of how strongly an optical system converges or diverges light
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focal length

Summary

focal length ranks in the top 2% of general entities by monthly Wikipedia readership (8,378 views/month).[1]

Key Facts

  • focal length is a type of length[2].
  • focal length is a type of physical quantity[3].
  • focal length's Commons category is recorded as Focal length[4].
  • focal length's described by source is recorded as Nordisk familjebok[5].
  • focal length's main Wikidata property is recorded as P2151[6].
  • focal length's different from is recorded as flange focal distance[7].
  • focal length's different from is recorded as depth of focus[8].
  • focal length's studied by is recorded as optics[9].
  • focal length's on focus list of Wikimedia project is recorded as Wikipedia:Vital articles/Level/4[10].
  • focal length's P14852 is recorded as 0000062[11].

Body

Definition and Type

Recorded subclass of include length[2] and physical quantity[3].

Why It Matters

focal length ranks in the top 2% of general entities by monthly Wikipedia readership (8,378 views/month).[1] It has Wikipedia articles in 29 language editions, a strong signal of global cultural recognition.[12] It is known by 72 alternative names across languages and contexts.[13]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [12] ↑ . Wikidata sitelinks. wikidata.org.
  3. [13] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). focal length. Retrieved October 2, 2026, from https://4ort.xyz/entity/focal-length
MLA “focal length.” 4ort.xyz Knowledge Graph, 4ort.xyz, 2 Oct. 2026, https://4ort.xyz/entity/focal-length.
BibTeX @misc{4ortxyz_focal-length_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{focal length}}, year = {2026}, url = {https://4ort.xyz/entity/focal-length}, note = {Accessed: 2026-10-02}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): focal length — https://4ort.xyz/entity/focal-length (retrieved 2026-10-02)

Canonical URL: https://4ort.xyz/entity/focal-length · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 14d ago · عُثمان · 2026-09-19 view diff on Wikidata ↗
    Different from → flange focal distance, depth of focus
    Studied by → optics
    Main wikidata property → P2151
    Subclass of → —
    + 5 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P14852]]: 0000062"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.