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我们只学过凸透镜成像,没学过凹透镜成像.但从凸透镜成像的规律和凹透镜对光线折射的作用可以总结出凹透镜成像的规律,这样运用到解题上就方便了许多. 凸透镜成像分三种情况: 1.在大于二倍焦距时成倒立缩小的实像; 2.在二倍焦距和焦距之间成倒立放大的实像; 3.在焦距以内成正立放大的虚像. 前两种情况像和物体都在凸透镜和主光轴的两侧.第三种情况像和物体都在凸透镜和主光轴的一侧.我们又知道凹透镜使光线发散且它的焦点又是虚焦
We have only studied lenticular imaging and have not studied concave lens imaging. However, the laws of imaging from convex lenses and the effect of concave lenses on refracting light can sum up the law of concave lens imaging. This makes it easier to apply a solution to the problem. There are three types of lenticular imaging. Situation: 1. Inverted and reduced real image when it is greater than twice the focal length; 2. Inverted and enlarged real image between double focal length and focal length; 3. Inverted and enlarged virtual image within the focal length. The first two cases of images and objects Both are on both sides of the convex lens and the main optical axis. In the third case the image and the object are on the side of the convex lens and the main optical axis. We also know that the concave lens makes the light diverge and its focus is virtual focal