利用分光计测量凹透镜的焦距  

Using Spectrometre To Measure the Focus Length of Concave Lens

作　　者：朱勋梦[1] 司民真[1] 

机构地区：[1]楚雄师范学院物理与电子科学系

出　　处：《物理通报》2010年第10期47-50,共4页Physics Bulletin

摘　　要：介绍了一种利用分光计来测量凹透镜焦距的新方法，该方法利用二维支架在水平方向移动凹透镜，得到两束垂直于透镜主截面的平行光束，测出两束平行光的间距和通过透镜后的发散角，利用几何关系计算出凹透镜的焦距，测出结果与辅助透镜成像法比较，相对误差可减小到0．22％．This paper represented a new method of measuring the focal length of concave lens used the spectrometer. The spectrometer was moved by the 2D scaffold in the horizontal direction, and the two parallel lights was gained perpendicular the main cross section of lens. The distance of the parallel lights and the divergence angle after the light through the spectrometer was measured. It can be calculated the focal length of concave lens by the geometric relationship. The related error can be reduced to 0.22% in the contrast of the auxiliary lens imaging.

关 键 词：凹透镜 焦距 分光计 角坐标 二维支架 

分 类 号：O435.1[机械工程—光学工程]