Define focus group. focus group synonyms, focus group pronunciation, focus group translation, English dictionary definition of focus group. n. A small group selected from a wider population and sampled, as by open discussion, for its members' opinions ab
plane 9 planks 2 plant 28 plant management 4 planting 1 plants 485 plants wallpaper 7 plasma 1 plastic 40 plate 4 platform 3 play 27 Play airline 4 played 1 player 2 playground 9 playing 29 playing together 2 playroom 1 please 2 plumbing 7 plums 1 pointi...
网络释义 1. 凹面镜聚焦 聚焦面,... ... ) plane of sharpest focus 锐聚焦面 ) concave mirror focus 凹面镜聚焦 ) toroidal focusing mirror 环面聚焦镜 ... www.dictall.com|基于2个网页© 2025 Microsoft 隐私声明和 Cookie 法律声明 广告 帮助 反馈...
(1) The focus of a curve of degree 2—an ellipse, a hyperbola, or a parabola—is a pointFlying in the plane of the curve and possessing the property that the ratio of the distance between any point on the curve andFto the distance to the directrix is a constant equal to the eccentri...
[New Latin, from Latin,hearth(probably in reference to the fact that a lens or parabolic mirror can concentrate sunlight on a single point to start a fire).] fo′cus·ern. American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt...
OPTICAL SCANNER FOR MAINTAINING FOCUS OVER A FLAT IMAGE PLANE Describes an optical scanning system of the type with an oscillating mirror (14) for scanning a flat field (16) by the displacement of the optical axis (12) of a focusing lens (10), and wherein the optical axis (18) of the...
condition the distance, after thetranslation parabola and the original parabola intercross, removes the parabola sections having point of inflection on both sides of intersection, obtains a conic combination parabola plane figure , circles its axis of symmetry to revolve then obtains a combination ...
Through a group to replace flat mirror-trough-type system in transition, and focus on the curved surface mirrors adjust control plane mirror reflections of sunlight, tilting angle to collect heat pipes, in order to simplify system, generally in water or water vapor as a heat absorption medium....
When the system was set up, a good quality plane mirror was used in place of the deformable mirror. The collimation of the green laser beam was checked with a shear interferometry at a number of locations in the system (between L2 and the mirror and between L4 and the sensor). The refe...
you can see where the focal plane of the scope is. Get a measurement of how far that is from the top of the focuser. That will be how much available back focus you have. Most visual newts are set up with like a quarter to half inch, most cameras have a longer flange distance than...