concave lens

1. A concave lens [ mirror]
   凹透镜[凹面镜]
2. The relation between the focal length of a concave lens and its reflective image properties is analysed and deduced.
   本文分析推导了透镜的凹面反射成像与凹透镜焦距的关系，介绍了利用此关系较方便地测量凹透镜焦距的方法。
3. Jinke Technology can produce flat convex ZnSe lens, flat concave ZnSe lens, double-side convex ZnSe lens, double-side concave ZnSe lens and other ZnSe or Ge lens.
   劲科科技可以生产加工多种规格的平凸硒化锌透镜、平凹硒化锌透镜、双凸硒化锌透镜、双凹硒化锌透镜等各种硒化锌、锗透镜。
4. In this paper, the parameters of an elliptic Gaussian beam passed through a double concave cylindrical lens are derived, by using the theory of Gaussian beam propagation and the ABCD Law. And the way to improve the effect of line-focus is pointed out.
   利用高斯光束的传播理论和ABCD定律，导出了椭圆高斯光束经一双凹柱透镜变换后的光束参量公式，指出了提高线聚焦效果的途径。
5. Plano Concave Cylinder Lens Properties of Angular Magnification in Laser Beam Scanning
   平凹柱透镜激光束扫描的角放大特性
6. The selection of concave lens in focal length measuring experiment by objective distance image distance method
   物距-像距法测凹透镜焦距实验中透镜的选择
7. As results of the experiment, the relations between the focal length of the thermal gas lens and the input power and buffer gas pressure are presented. The evolution process of the thermal gas lens from concave to convex lens is described.
   在实验部分，本文给出了热气体透镜焦距与输入功率、缓冲气体压强的关系，描绘了热气体透镜从负透镜变化到正透镜的动态过程。
8. Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
   该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
9. A method of measuring precisely the radial of a concave lens
   一种较精确测量凹透镜球面半径的方法
10. Results: If the standard adjusted by the special lenses group is used to check the contact lenses, the power of contact lenses will become low both in convex lenses and concave lenses, thus lower the visual acuity in the eye that wears contact lens.
    结果：以采用接触镜专用标准透镜组标定后的焦度计为尺度来检测和规范角膜接触镜的顶焦度，无论远视还是近视焦度都会降低，导致配戴眼视力下降。
11. We fabricated a large computer-generated holography on a concave lens surface to test the convex secondary mirrors surface.
    在凹透镜表面上制作出了用于凸非球面检测的曲面全息图。
12. This paper describes a diverging fibre that is analogous to a concave lens.
    本文讨论一种发散型光学纤维，它类似于凹透镜。
13. Effects of concave lens on eyes of guinea pig
    凹透镜对豚鼠眼生长及屈光发展的影响
14. Measuring the focal length of a concave lens with the method of reflection
    反射法测凹透镜焦距
15. In order to decrease the area of information windows and improve the directivity of each transducer, the emitter and the receiver are respectively installed with the plano concave lens and the choice direction lens.
    为了能有效地减小信息窗区域的尺寸，本文为发射换能器和接收换能器分别加装了平凹透镜和方向选择透镜，以此来提高各换能器对声波的指向性。

noun

1. a lens such that a parallel beam of light passing through it is caused to diverge or spread out

   Synonym:    diverging lens