concave lens

漢語翻譯

英文解釋：

名詞 concave lens:

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

例句：

1. Just as a double convex lens enlarges, so a double concave lens reduces.
   正象雙凸透鏡可以放大那樣，雙凹透鏡也可以縮小。