focal length

fo·cal length

F f

- US Pronunciation
- US IPA
- UK Pronunciation
- UK IPA
- [foh-kuh l lengkth, length, lenth]
- /ˈfoʊ kəl lɛŋkθ, lɛŋθ, lɛnθ/
- /ˈfəʊ.kəl leŋθ/

Definitions of focal length words

noun focal length the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol: f. 1
noun focal length the distance between an object lens and its corresponding focal plane in a telescope. 1
noun focal length the distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens 0
noun focal length the distance from the optical center of a lens or curved mirror to the point where light rays from a very distant object converge 0

before 1745

One of the 47% newest English words

First recorded in 1745-55

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

This term is known only to a narrow circle of people with rare knowledge. Only 27% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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