摘要
根据费马原理，设想出一个由旋转椭球面与半径等于椭球短半轴的球面组成的透镜，使具有一定宽度的平行光束通过透镜后聚焦．
Based on Fermat's principle, an optical lens which consist of a rotary ellipsoid and a sphere is designed so that a certain width of parallel light beam will focus at a point exactly.
出处
《大学物理》
1997年第10期26-27,共2页
College Physics
