converging lens

1. It's an easy matter to observe chromatic aberrations, with a thick, simple converging lens.
   用一厚的简单会聚透镜很容易观察色差。
2. There are two methods of converging calibration light, one is using convergent lens, the others self-focus lens.
   根据聚光结构的不同，定标光源使用聚光镜和自聚焦镜两种方案；

noun

1. lens such that a beam of light passing through it is brought to a point or focus

   Synonym:    convex lens