| 1. | Under astigmatism even narrow parallel light beams will not combine into one point .
有象散存在时甚至很窄的平行光束都不能会聚在一点。 |
| 2. | A parabolic concave mirror can converge parallel light rays to its focus , and also collimate light rays that pass through its focus
抛物面凹镜会把平行而来的光线聚集在一点焦点，亦会把源自焦点的光线平行向外反射。 |
| 3. | A parabolic concave mirror can converge parallel light rays to its focus , and also collimate light rays that pass through its focus
抛物面凹镜会把平行而来的光线聚集在一点(焦点) ，亦会把源自焦点的光线平行向外反射。 |
| 4. | When voltage is applied , however , these same molecules arrange themselves in a specific direction in such a way as to permit parallel light to pass through the glass
当液晶体份子任意地排列时,光线就不能透过玻璃.但当液晶体份子排列成某一方向,平衡的光线就可透过玻璃 |
| 5. | A type of small - sized interferometer is reported , which makes use of the coupling of optical fiber and gradient index lens ( grin ) to form parallel light beams
摘要介绍一种超小型光纤导光干涉仪，它利用光纤和自聚焦透镜的耦合来形成平行光路，利用半反和全反光学膜片分光。 |
| 6. | A concave mirror reflects parallel light rays so that they meet at the so - called focal point . ( if you try to use such a mirror to start a fire in sunlight , you place the tinder at the focal point . ) the distance from the mirror to the focal point is its focal length
凹面镜反射平行光，让光线汇聚到所谓的焦点（如果你想用这种镜子在日光下起火，就要把易燃物放在焦点上） ，从镜面到焦点的距离就是焦距。 |
| 7. | So the base decided to rebuild the system , in the rebutided detect - calibrating system , closing control technique has been adopted and the guiding accuracy has been greatly improved . at the same time , it has adopted multiple parallel light - pipeline scanning technique , and the efficiency of detect - calibrating has remarkably enhanced
在改造后的检校系统中，采取了闭环控制，提高了引导精度，同时采用单航路多平行光管的扫描，提高了检校效率。 |
