lenses

• A lens is an optical system including two refracting surfaces .
  一个透镜是包含两个折射面的光学系统。
• The lens through which we view the image is called the eyepiece lens .
  我们用于观察像的透镜称为目镜。
• As shown in the figure, the device is set up to examine a lens .
  图中所示的仪器是为检验透镜安装起来的。
• We introduce a negative lens which will diverge the rays a bit .
  我们用一块负透镜，它将使光线发散一些。
• The principal points of a thin lens coincide at the center of the lens .
  薄透镜的两个主点与透镜中心相重合。
• The lens can be manipulated to produce an enlarged or reduced image .
  镜头可调整，以摄制出放大或缩小的图像。
• The focal length of a given lens is different for different colors .
  一个特定的透镜的焦距因颜色的不同而不同。
• The beam of flashlight diverges, but it can be refocused with lenses .
  一个发散的闪光灯束可以用透镜重新聚焦。
• His eyes seemed to goggle larger than usual behind the heavy lenses .
  在厚厚的镜片后面，眼睛瞪得比平时大得多。
• I would stand and watch the two white men grinding lenses on the machines .
  我站着看那两个白人在磨床上磨镜片。