n-th focal point
31focal point — the location of an organism; in fish usually taken as the position of the snout when maintaining a station. The position should be maintained for at least 10 seconds …
32Focal point — Фокус …
33focal point — [ˈfəʊk(ə)l ˌpɔɪnt] noun [C] the most important, interesting, or attractive part of something …
34Focal — may refer to:*Focal (lexicographical website), an Irish lexicographical website *FOCAL (programming language) **FOCAL 69 **Focal (HP 41) *Relating to focusee also*Focal point (disambiguation) *Focal adhesion *Focal character *Focal dystonia… …
35Focal — Fo cal, a. [Cf. F. focal. See {Focus}.] Belonging to,or concerning, a focus; as, a focal point. [1913 Webster] {Focal distance, or length, of a lens or mirror} (Opt.), the distance of the focus from the surface of the lens or mirror, or more… …
36Focal distance of a telescope — Focal Fo cal, a. [Cf. F. focal. See {Focus}.] Belonging to,or concerning, a focus; as, a focal point. [1913 Webster] {Focal distance, or length, of a lens or mirror} (Opt.), the distance of the focus from the surface of the lens or mirror, or… …
37Focal distance or length of a lens or mirror — Focal Fo cal, a. [Cf. F. focal. See {Focus}.] Belonging to,or concerning, a focus; as, a focal point. [1913 Webster] {Focal distance, or length, of a lens or mirror} (Opt.), the distance of the focus from the surface of the lens or mirror, or… …
38focal length — n technical the distance between the centre of a lens and the focal point …
39focal length — noun count SCIENCE the distance from the center of a LENS or mirror to its focal point …
40Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… …
