单词 | focimeter |
释义 | focus /fōˈkəs/noun (pl foci /fōˈsī/ or foˈcuses)
ORIGIN: L focus a hearth fōˈcal adjective Of, belonging or relating to a focus focalizāˈtion or focalisāˈtion noun fōˈcalize or fōˈcalise transitive verb (technical) To focus fōˈcally adverb focimeter /fō-simˈi-tər/ noun An instrument for measuring the focal length of a lens foˈcusing noun A psychotherapeutic technique involving self-awareness focal distance noun Focal length focal infection noun A localized bacterial infection, eg of a gland, etc focal length noun The distance between the centre of a lens and its focus focal plane noun The plane, at right angles to the principal axis of a lens, in which the image is formed focal-plane shutter noun A camera shutter in the form of a blind with a slot, which is pulled rapidly across, and as close as is practicable to, the film or plate, speed being varied by adjusting the width of the slot focal point noun
focus fund noun An investment fund containing shares in a relatively small number of companies focus group noun A small number of people assembled to discuss a topic, new product, etc so that researchers may benefit from their opinions focusing cloth noun A cloth thrown over a photographic camera and the operator's head and shoulders to exclude extraneous light when focusing conjugate foci (optics) Two points such that each is the focus for rays proceeding from the other in focus Placed or adjusted so as to secure distinct vision, or a sharp, definite image principal focus (optics) The focus for rays parallel to the axis |
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