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Expect further routing
| Словарь терминов и сокращений в авиации |
Ожидай те дальнейших указаний о маршруте
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Efr, английский
- Улучшенное качество речи. поддержка данной функции должна осуществляться как телефоном, так и оператором связи. допускает передачу данных до 14400 кбит/с.
- Expect further routing
- Extended flight rules (freer)
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Efrc, английский
Edwards flight research center
Effective focal length, английский
- Эффективное фокусное расстояние
- A series of parallel rays entering a positive lens will be bent toward the optical axis and brought to a focus, “focal point”. if the entering and exiting rays are extended to their intersection points, these points form the lens’ “principal plane”. the intersection of the principal plane with the optical axis is the “principal point” of the lens. the “” (efl) of the lens is the distance from the principal point to the focal point. tel 203•377•8282 fax 203•378•2457 e-mail res_sales@oriel.com url www.oriel.com the following three pages briefly define the optical terms used most frequently in the preceding lens theory section, and throughout this catalog. these definitions are limited to the context in which the terms are used in this catalog. entering rays exiting rays ? = object angle y = image size k principal plane principal point yk ?0 effective focal length (efl) efl yk tan ?0 = lens lens focal point fig. 1 the efl of a lens is equal to the image size divided by
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