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初中阶段,相当一部分人都觉得物理课难教、难学.而我认为关键是教师采取什么样的教法.下面谈一下自己的几点浅见.一、应用几何知识,巧记凸透镜成像规律.在教凸透镜成像时,学生容易死记硬背凸透镜成像的几种情况,很吃力.而巧妙的利用几何知识,可收到事半功倍的效果.分五种情况,画出光路图如图1.1.u=2f 把一物体 AB 放在凸透镜左侧2倍焦距 A_1B_1 处,A_1在主光轴上,作平行于主
In junior high school, quite a few people think that physics lessons are difficult to teach and difficult to learn. And I think the key is what kind of teaching method teachers should adopt. Let’s talk about some of my own points of view. First, apply geometric knowledge, and skillfully remember the imaging law of convex lenses. When teaching lenticular imaging, students can easily memorize several cases of hard-convex lenticular imaging, which is very laborious. Clever use of geometry knowledge can yield a multiplier effect. In five situations, the optical path diagram is drawn as shown in Figure 1.1.u= 2f Place an object AB 2x focal length A_1B_1 on the left side of the convex lens, A_1 is on the main optical axis, parallel to the main