The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.
屈光正常当平行光线恰好聚焦于视网膜并形成清晰视觉时正常眼睛的状态
"Diverging lens causes the rays of a parallel beam of light to spread out and appear to come form a point, i.e. the rays diverge. It produces a virtual image at its principal focus. Such a lens is thinner at the center than at the edge"
散光镜使一束平行光线散开而形似出发于一点,在其主焦点上产生虚像, 这种透镜的心比边缘薄
Visiblity for A Set of Segments Based on Parallel Light in the Plane;
平行光照射下平面内一组线段的可见性
Modeling of Evanescent Coupling between Parallel Optical Nanowires;
平行光学纳米线间的倏逝波耦合特性研究
light broke over the horizon; Voices broke in the air.
光线产生于地平线处。
collimated laser beam
激光平行光束，平行激光束
a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum.
表面上带有许多平行的凹槽；把光线疏散到波长里以产生光谱。
Performance of a soft x-ray splitter grating parallelism measuring system by diffraction method
衍射法X射线激光分束光栅平行度测量系统(英文)
Telecentric operation (field rays leave parallel to optical axis, unlike Barlow lenses which diverge rays).
远心手术（场射线离开平行光轴，不像巴卢镜片，其中发散射线）。
a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere.
平行于地平线在太阳高度发光的晕；由大气的冰晶造成。
Spot/Directional Light
目标聚光灯/平行光
collimated lihgt beam
准直光束，平行光束
Spot/Directional Light Vie
目标聚光灯/平行光视图
paralleled plate electrode type phototube
平行平板电极式光电管
produces plane-polarized ultraviolet light.
产生紫外线光偏振平面。
low light level television camera-sextant
低光水平线电视六分仪
photoelectrically balanced slidewire potentiometer
光电平滑线式电位计
The collimated light goes through a1/4 wave plate. This converts it into circularly polarized light.
经过准直镜校准后的光线射入四分之一波板。平行偏振光又被转化为圆偏振光。