In photography, an instrument used to measure the intensity of light from a scene to be photographed and to indicate the camera lens and shutter settings required to expose the film correctly.
zamân-e osneheš, ~ nurdâd
Fr.: temps de pose
The length of time during which the receiver is irradiated.
M.E. expressen, O.Fr. espresser "to press, squeeze out; speak one's mind," M.L. expressare, frequentative of exprimere "represent, describe," literally "to press out," from → ex- "out" + pressare "to press, push," from L. premere "to press, hold fast, cover, compress."
Zohâvidan, from zo- variant of os- "out," → ex-, + hâv, from Av. hau- "to press, squeeze out;" cf. Mid.Pers. hunîdan "to express, extract (juice)," hâwan "mortar;" akin to Skt. sav- "to press, press out;" O.H.G. sou, O.E. sēaw "juice;" + -idan infinitive suffix.
1) The act or an instance of expressing.
To stretch out; draw out to the full length; to enlarge the scope of; to increase the length or duration of.
From O.Fr. estendre, from L. extendere "stretch out," from → ex- "out" + tendere "to stretch," see below.
Ostanidan, from os-, → ex- + tanidan as in Av. ustāna- "stretched out" (ustāna-zasta- "with outstretched hands"), cf. Skt. uttāná- "stretched out, spread out." Mod.Pers. tanidan "to spin, twist, weave;" Mid.Pers. tanitan, from Av. tan- to stretch, extend;" cf. Skt. tan- to stretch, extend," tanoti "stretches," tantram "loom;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" PIE base *ten- "to stretch."
Fr.: objet étendu
An object whose angular size exceeds the resolution of the instrument used to observe it.
Fr.: source étendue
In radio astronomy, a source whose angular extent could be measured, as distinguished from a point source.
1) An act or instance of extending; the state of being extended.
Verbal noun of → extend.
The range over which a thing extends; length, area, volume, or scope.
1) boruni (#); 2) borun (#)
1) Outer; being on the outer side; situated or being outside,
which is outside.
From L. exterior "outward, outer, exterior," comparative of exterus "on the outside, outward, outer, foreign," itself a comparative of → ex- "out of."
Boruni, from borun, variant of birun "out, the outside," → out.
Fr.: angle extérieur
1) Any of the four angles that do not include a region of the space between
two lines intersected by a third straight line
Of or pertaining to the outside or outer part.
Biruni, adj. from birun "out, the outside," → out.
external photoelectric effect
oskar-e šid-barqi-ye boruni
Fr.: effet photoélectrique externe
The → photoelectric effect in solids where free electrons are emitted from the surface of a substance (e.g., → semiconductor) when radiation of appropriate frequency falls on it. Also called → photoemissive effect.
Fr.: travail externe
The work done by a thermodynamic system as it expands against its surrounding environment. It is equal to ∫pdV, where p is the applied external pressure and V the volume, integrated from the initial V1 to final V2.
Verbal noun of → externalize.
1) To make external; embody in an outward form.
1) Dimming of light by an intervening medium (the Earth's atmosphere or the interstellar medium).
It is usually due to both scattering and absorption.
Noun of extinct, from L. extinctus, p.p. of extinguere "to quench, wipe out," from → ex- "out" + stinguere "to quench," from PIE base *steig- "to prick, stick, pierce;" cf. Mod.Pers. tiz, tež, tig, tej, tij, tiq "sharp;" Av. tiγra- "pointed," tiγray- "arrow;" → deblur.
Xâmuši, noun of xâmuš "extinguished; silent," Mid.Pers. xâmôš "silent;" cf. Skt. amrs- "to bear patiently."
Fr.: coefficient d'extinction
Gradient of apparent magnitude with air mass.
Fr.: correction d'extinction
In → photometric calibration, the correction for energy loss undergone by radiation due to the → atmospheric extinction. Extinction correction is done using → standard stars observed at different → airmasses.
Fr.: courbe de l'extinction interstellaire
A graph representing the variation of the → interstellar extinction against → wavelength. Usually it displays the → normalized values of extinction as a function of (the → inverse) of the wavelength (in → microns). See, e.g., Sandage & Mathis, 1979, Ann. Rev. Astron. Astrophys. 17, 73.