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实物经凹透镜所成的象总是正立、缩小的虚象。要确定所成虚象的位置比较困难,所以为测定凹透镜的焦距,常要借助凸透镜、平面镜等光学元件,方法比较繁复。 本文介绍一种测定凹透镜焦距的简便方法:直接将凹透镜所成的虚象与实物比较测得象的横向放大率,同时测出物距,我们就可根据物距和放大率求得凹透镜的焦距。
The image formed by a concave lens is always an upright and a reduced virtual image. To determine the position of the resulting virtual image is difficult, so to determine the focal length of the concave lens, often with the aid of optical elements such as convex lenses, flat mirrors, etc., the method is more complicated. This article describes a simple method for measuring the focal length of a concave lens: directly comparing the virtual image formed by the concave lens with the real object to measure the lateral magnification of the image, and measuring the object distance at the same time, we can obtain the focal length of the concave lens according to the object distance and magnification. .