薄透镜焦距的测量研究

On the Measurement of Focal Length of Thin Lens

在简单介绍物距像距法、两次成像法、自准直法和成等大像法等四种测量薄透镜焦距的实验原理的基础上,以一个已知焦距的薄透镜为研究对象,分别利用这四种方法的原理对其焦距进行实验测量。对所得的结果进行比较,分析各种方法产生误差的原因及其适用范围,并得出成等大像法是这四种测量方法中相对较好的方法的结论。

The object image distance method,two time imaging method,autocollimation method and big image method are briefly introduced. A thin lens with a known focal length serving as research object,the focal length is experimentally measured by the theory of the four methods. The results are compared and the reasons and scope of application of different methods are analyzed. It is found that the big image method is better than others.