位移法测量透镜焦距的最佳位置分析

Analysis of Optimal Position for Measuring Focal Length of Convex Lens by Displacement Method

本文以位移法测量薄凸透镜的焦距并讨论焦距误差的计算方法,着重讨论清晰像位置判断引起的测量误差,同时分析改变物距对透镜焦距测量误差的影响,得出薄凸透镜焦距测定的较准确范围。

In this paper,the focal length of thin convex lens is measured by displacement method and the calculation method of focal length error is discussed.The measurement error caused by position judgment of clear image is discussed,and the influence of object distance on focal length meas-urement error of the lens is analyzed.The accurate range of focal length determination of thin convex lens is obtained.