Fr.: épaisseur optique
Same as → optical depth.
optical transfer function (OTF)
karyâ-ye tarâvaž-e nuri
Fr.: fonction de transfert optique
The function that provides a full description of the imaging quality of an optical system. A combination of the → modulation transfer function (MTF) and the → phase transfer function (PTF) , the OTF describes the spatial (angular) variation as a function of spatial (angular) frequency.
Fr.: fenêtre optique
The optical portion of the electromagnetic spectrum that passes through the atmosphere all the way to the ground.
Adverb of → optical.
→ optical + -ly.
Fr.: optiquement actif
Relating to → optical activity.
nurâné setabr, nurikâné ~
Fr.: optiquement épais
The qualifier of a medium in which the → optical depth is large, significantly larger than 1.
optically thick wind
bâd-e nurâné setabr
Fr.: vent optiquement épais
A wind with the → sonic point located at large optical depth for continuum. In particular, → Wolf-Rayet star winds are → optically thick. However, the outer parts of W-R winds are → optically thin for continuum, and in those regions the matter flow is driven by the same mechanism as in the winds of OB stars.
nurâné tonok, nurikâné ~
Fr.: optiquement mince
The qualifier of a medium in which the → optical depth is large, significantly smaller than 1.
optically violent variable (OVV) quasar
kuâsâr-e vartande-ye nurâné surâ
Fr.: quasar variable optiquement violent
A member of a small subset of quasars consisting of bright radio galaxies whose flux of visible light output can vary by as much as 50% in a single day.
1) eynak-sâz; 2) nurikâr, nurik-kâr
1) A maker or seller of optical glass.
From Fr. opticien, from M.L. optic(a), → optics, + -ien "-ian."
1) Eynak-sâz "eyeglass maker," from eynak→ eyeglasses + sâz agent noun of
"to build, make, fashion; to adapt, adjust, be fit" (from
Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare,
to form;" Av. sak- "to understand, to mark,"
sâcaya- (causative) "to teach").
The branch of physics that deals with the properties and phenomena of electromagnetic radiation in the wavelength range extending from the ultraviolet (at about 40 nm) to the far-infrared (at 1 mm) and with vision.
Optics, from optic, from M.Fr. optique, from M.L. opticus "of sight or seeing," from Gk. optikos "of or having to do with sight," from optos "seen, visible," from op-, root of opsesthai "be going to see," related to ops "eye," from PIE *okw- "eye; to see" (→ eye); → -ics.
One that minimizes or maximizes some quantity or combination of quantities, such as time, energy, distance, path, etc.
Optimal, adj. of → optimum.
The fact of optimizing. The condition of being optimized.
Verbal noun of → optimize
behinidan, behin sâxtan
General: To make as effective, perfect, or useful as possible.
Behinidan, from behin, → optimum, + -idan infinitive suffix. Behin sâxtan compound verb from behin + sâxtan, sâzidan "to build, make, fashion; to adapt, adjust, be fit" (from Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form;" Av. sak- "to understand, to mark," sâcaya- (causative) "to teach").
In computer science, a program that optimizes the speed or resource utilization. → optimize.
Agent noun of → optimize.
The best or most favorable point, degree, amount, etc. The greatest degree or best result obtained or obtainable under specific conditions.
From L. optimum, neuter singular of optimus "best" (used as a suppletive superlative of bonus "good").
Behiné, from behin superlative of beh "good, fine" (Mid.Pers. veh "better, good;" O.Pers. vahav-, vahu-; Av. vah-, vohu- "good;" cf. Skt. vasu- "good;" Hittite wasu-; Gaulish vesus "good") + -in superlative suffix + -é nuance suffix.
opteš, goziné (#)
1) The power or right of choosing.
Left to one's choice; not required or mandatory (Dictionary.com).
Any of various instruments for measuring refractive errors of the eye.
From opto- "vision; eye; optis," combining form from Gk. optos "seen, visible," from opsesthai "be going to see," related to ops "eye;" → -meter.
A → conjunction word used to indicate alternatives.
M.E., from or, adverb "early, before," from Old Norse ār akin to O.E. ær "early."
Yâ, from Mid.Pers. ayâb, aviâp "or;" cf. P.Pers. ada, Av. adā, aδa "then."