测凹透镜焦距的新方法

A new method to measure the focal length of concave lens

本文提出了一种测凹透镜焦距新方法并作了分析．此法克服了常用测量法中人为主观因素的影响，把判断成象的清晰度转化为判断折射光的平行度．

In this paper is proposed a new method for measuring the focal length of con-cave lens in which the determination of the clarity of the image formation is convertedinto determination of the depth of parallelism of refractive light, so as to eliminate theerrors induced by subjective factors as is often the case in measurement methods in com-mon use.