concave-lens

英['kɒŋkeɪvl'enz] 美['kɒŋkeɪvl'enz]
  • 凹透镜
  • concave adj.凹的n.凹面;凹线;凹形
  • volume n.卷;体积;册;音量;容量
名词 concave lens:
  1. a lens such that a parallel beam of light passing through it is caused to diverge or spread out