就是从透镜(或者主反射镜)到焦点的距离，通常单位是毫米(mm)。
This is the distance (usually in mm.) from the lens (or primary mirror) to the point where the telescope is in focus (focal point).
通常，由于不同的反射镜和透镜使用，整个车灯组装就必须替换在切换到HID灯。
Usually, due to the different reflectors and lenses used, the whole headlight assembly will have to be replaced during the switch to HID lamps.
光经过透镜或反射镜得以集中，然后通过光导管进入室内。
The light is concentrated using lenses or mirrors and is then transmitted to building interiors by 'pipes'.
CCD与光纤阵列之间采用反射镜和透镜耦合方式，使CCD避开中子源直接辐照。
To avoid direct radiation from neutrons, the CCD is coupled to the array by a mirror and lens optics.
讨论了由单一二次反射镜和放在其后的两透镜无光焦度校正板组成的光学系统的像差特性。
The aberration characteristics of the optical system of a single conic reflector and a two-lens null corrector are discussed.
胶片的曲率是和弯月透镜后面的反射镜同心的。
The curvature of the film is concentric with the mirror behind the meniscus.
描述了对长焦距布拉格-菲涅耳透镜与可变曲率半径反射镜组合所做的实验研究。
An experimental investigation of the combination of a long focal distance Bragg-Fresnel lens with a bimorph mirror is described.
该装置的光学系统包括透镜、反射镜及投影屏等，其它部分包括载有各种发型模式影像的胶片。
The optical system of the device comprises a lens, a reflecting lens, a projection screen, etc. Other parts of the device comprise image films with various hair style modes.
采用美国进口反射镜和透镜，光斑更细、切割力更强。
Adopt imported reflect mirror and lens from America, makes the facula thinner and the cut stronger.
介绍了自适应反射镜和透镜的原理及其在一般激光切割、厚钢板的激光锯切和三维激光焊接中的应用。
The theory and a new application of adaptive optics are described in conventional laser cutting, thick sheet metal laser sawing and three dimension laser welding.
本实用新型的光学系统包括反射镜、透镜及投影屏等，其它部分包括载有各种发型模式影像的胶片。
The optical system of the utility model comprises a reflecting lens, an optical lens, the projection screen, etc. Other parts comprises image films with various hair style patterns.
该刀具的传统应用领域主要是激光反射镜、红外透镜的加工，以及用于制作类似DVD信号检出探头透镜的塑料透镜注射模的加工。
The conventional applications were mainly for the processing of laser mirrors and metal molds of plastic lenses such as infrared lenses and DVD player pickup lenses.
后座反射镜，视野宽阔，不会阻碍后视镜的能见度，也不需将孩子直接对着后视镜，凸透镜最大最清晰地映射出所有后座镜子的情况。
Easy View does not block rear visibility and does not need to be positioned directly over a child. The shallow convex shape offers the largest, clearest reflection of any back seat mirror.
后座反射镜，视野宽阔，不会阻碍后视镜的能见度，也不需将孩子直接对着后视镜，凸透镜最大最清晰地映射出所有后座镜子的情况。
Easy View does not block rear visibility and does not need to be positioned directly over a child. The shallow convex shape offers the largest, clearest reflection of any back seat mirror.
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