a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly" 同义词：principal axis,
in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"
例句与用法
1.
When we applied electric field , the the oritation of liquid crystal molecule axis reset . it induced the roate of optic axis . at last , the birefringence will change . this is the voltage - dependent birefringence of liquid 例如当对液晶施加电场时，液晶分子轴的排列会变化，从而引起液晶光轴的转动，最终导致了液晶双折射率的变化，这就是我们所说的液晶电控双折射特性。
2.
In order to measure the field of view matching of digital binoculars , the depth of optic axis parallelism and field of view matching are measured respectively . the collimator and pre - set lens are used to measure the depth of parallelism of optic axis . field of view meter is used to measure the field of view of binoculars and camera 为了检验数码望远镜的视场匹配度,提出了采用平行光管和双管前置镜的组合测量光轴平行度以及采用视场仪测量数码望远镜的望远镜和数码相机的视场大小的方式,并对数码望远镜的视场匹配度与望远镜和数码相机的视场大小关系进行了理论推导,导出了数码望远镜的视场匹配度测量的实际计算公式。
3.
The model of influence upon the parallel between servo optic axis from the angle error of installation plans presented . whereby the theoretic analysis is carried out and the analyzing results are obtained . the method of obtaining the angle error through measuring the installation plans with three - coordinates measuring device and fitting the measurement data is put forward and pave a road for lessening the influence 对安装面角误差影响随动光轴平行性的问题也建立了数学模型，以此为出发点进行理论分析，给出了分析结果；提出用三坐标测量机测量安装面，通过拟合得到安装面的角误差；从而为减小这一误差源对随动光轴平行性的影响铺平了道路。
4.
By using a reflector and two pentaprisms , one beam of light is separated into two parallel beams , then respectively they are received by two optical systems of the large scale photoelectric theodolite with certain imaging d - value which correspondingly represents each optic axis parallel error of these two optical systems 方法是利用一块反射镜和两块五棱镜将一束准直光束分光成两束平行光束，大型经纬仪的两个光学系统分别接收这两束平行光，两束平行光所成像的脱靶量差值即为两光学系统的光轴平行度。
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