凸透镜成像规律是光学中的重点,其动态变化规律更是重点中的难点,很多同学感觉物距、像距变化的题目很难,主要是对凸透镜成像规律记得不牢、用得不熟所致.我们可以用作图法来帮助自己理解和记忆凸透镜成像的变化规律.一、记住三条特殊光线首先要理解像产生的原因:如图1,一个发光点经过凸透镜成了像,像是物体 Convex lens imaging is the focus of optics, the dynamic changes in the law is more difficult in the key point, many students feel the object distance, like changes from the subject is difficult, mainly for the imaging laws of convex lens remember not used, not used due to unfamiliar We can use it as a diagram to help you understand and remember the changing law of convex lens imaging. First, remember the three special lights First of all we must understand the reasons for the image: As shown in Figure 1, a luminous point has become like a convex lens,