TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

Abbe’s diffraction limit amounts for the shortest wavelength of visible light to about 200 nm [nanometers] for the lateral resolution. Smaller details cannot be resolved.  2, record 1, English, - Abbe%27s%20diffraction%20resolution%20limit

Record number: 1, Textual support number: 1 OBS

The light microscope's limited spatial resolution was first recognized by Ernst Abbe at the end of the 19th century... Abbe found that objects closer than about one-third of the wavelength of light could not be distinguished, because this is the smallest focal spot size that is allowed by diffraction when focusing with a lens of high numerical aperture.  1, record 1, English, - Abbe%27s%20diffraction%20resolution%20limit

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Le microscope est depuis longtemps utilisé pour observer le monde vivant à petite échelle. [...] en dessous de 250 nanomètres (un quart de micron), les objets ne sont plus que des taches, car la lumière renvoyée par chaque point de l'objet ne peut être distinguée de celle du voisin, elles se confondent en s'élargissant. C'est la limite de diffraction d’Abbe, posée par Ernst Abbe en 1873.  4, record 1, French, - limite%20de%20diffraction%20d%27Abbe

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 OBS

Microscope objectives use the principle of aplanatic refraction and to reduce the refraction at the front lens of the objective for higher powers, cedar wood oil(refractive index 1. 517) is placed between the cover glass(index 5. 1, say) and the plane surface of the front lens of higher index... Besides aiding aplanatism the numerical aperture is increased by this process, which therefore increases resolving power.  2, record 2, English, - immersion%20objective

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Objectif d'un microscope conçu pour être utilisé avec une goutte d'un liquide réfringent entre l'objet et la face d'entrée de l'objectif.  2, record 2, French, - objectif%20%C3%A0%20immersion

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 CONT

[El] oscurecimiento de la imagen puede evitarse, en parte, empleando para los aumentos muy grandes objetivos de inmersión, con los cuales se suprime la capa de aire entre la lente frontal y el objeto o el cubreobjeto interponiendo entre ambos una gotita de líquido (aceite de cedro, por ejemplo) de elevado índice de refracción. Así se evita la pérdida de los rayos de luz desviados por el aire fuera del objetivo.  1, record 2, Spanish, - objetivo%20de%20inmersi%C3%B3n

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

Normalized frequency(V Number). A mathematical expression characterizing a fiber in terms of its essential data(core diameter, numerical aperture) and the wavelength. Important parameters such as number of modes, mode field diameter, cutoff wavelength, propagation constant and chromatic dispersion can be calculated using V number.  1, record 3, English, - normalized%20frequency

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Paramètre servant à déterminer le nombre moyen de modes de propagation pouvant coexister dans une fibre optique.  2, record 3, French, - fr%C3%A9quence%20normalis%C3%A9e

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 OBS

The fiber has a numerical aperture of 0. 17 and a single mode cut-off wavelength of 1270 nm.  2, record 4, English, - cut%2Doff%20wavelength%20of%20a%20mode

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Longueur d'onde maximale assurant le maintien d'un mode lié, spécifique, dans un guide d'ondes.  1, record 4, French, - longueur%20d%27onde%20critique%20d%27un%20mode

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

The numerical aperture(NA) is then given by the launching cone of the light....  1, record 5, English, - launching%20cone

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

Le cône d'injection de la lumière donne donc l'ouverture numérique (ON) (...)  1, record 5, French, - c%C3%B4ne%20d%27injection

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

Stereozoom Microscopes. Mention was made earlier that the zoom concept is particularly well suited to stereomicroscope applications. This is due to the fact that the upper useful magnification range of numerical aperture objectives.(...) The two zoom lenses in Fig. 3A are cam driven in the conventional fashion and the first zoom lens is designed to vary the effective numerical aperture in much the same way as described for the compound microscope in Fig. 1B.  2, record 6, English, - stereozoom%20microscope

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 CONT

Le microscope stéréoscopique à zoom est un perfectionnement récent [du microscope stéréoscopique] qui permet de faire varier le grossissement dans certaines limites. Beaucoup de microscopes stéréoscopiques modernes ont une application précise, comme l'assemblage répétitif, et ont un grossissement unique.  1, record 6, French, - microscope%20st%C3%A9r%C3%A9oscopique%20%C3%A0%20zoom

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 OBS

when--is used between condenser and slide(...) the numerical aperture may be as large as 1. 6  1, record 7, English, - immersion%20oil

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 OBS

il est essentiel d'employer (...) l'huile à immersion que recommande le fabricant de l'objectif [aussi appelé huile d'immersion LAMIC 49 82]  1, record 7, French, - huile%20%C3%A0%20immersion

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 OBS

when--is used between condenser and slide(...) the numerical aperture may be as large as 1. 6  1, record 8, English, - immersion%20oil

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 OBS

les résultats sont encore meilleurs lorsque le liquide d'immersion a la même indice de réfraction que le verre.  1, record 8, French, - liquide%20d%27immersion

Record 8,  Textual support,  Spanish