透镜组基点的一种简单测量方法

A simple method for measuring the cardinal point of a lens system

利用氦 -氖激光器单向性好的特点 ,将激光束视为光线来处理 ,应用几何光学作图原理 ,简便。

With laser beam as light ray,we simply and quickly measure the focal distance of lens and the cardinal point of lens system,basing on the principles of geometrical optics.