有象散存在时甚至很窄的平行光束都不能会聚在一点。
Under astigmatism even narrow parallel light beams will not combine into one point.
这些照明元件确定为需要为当前观察者位置生成平行光束。
The lighting elements required for generating parallel light beams in the viewer's actual position are determined.
然而，这种散射的光束可以通过镜头的帮助被转化成平行光束。
However, such a divergent beam can be transformed into a collimated beam by means of a lens.
用一辅助凸透镜与一测微目镜进行平行光束的会聚，测出准直管玻罗板线对在辅助凸透镜焦平面上所成像的大小；
Then using another convex lens and a micrometer eyepiece the altered parallel rays is focused, and the imaging size of line pair of collimator imaged on the another convex lens is measured.
根据高斯光束与理想平行光束的对比，给出了若干结论，从而保证了在利用光束衍射进行某些测量工作时的测量精度。
According to comparison between the Gaussian beam and ideal parallel beam, some conclusions are given which ensure the measuring fineness when we make some measurements with the beam diffraction.
根据高斯光束与理想平行光束的对比，给出了若干结论，从而保证了在利用光束衍射进行某些测量工作时的测量精度。
According to comparison between the Gaussian beam and ideal parallel beam, some conclusions are given which ensure the measuring fineness whe...
根据高斯光束与理想平行光束的对比，给出了若干结论，从而保证了在利用光束衍射进行某些测量工作时的测量精度。
According to comparison between the Gaussian beam and ideal parallel beam, some conclusions are given which ensure the measuring fineness whe...
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