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八年级物理上册5.1透镜习题（无答案）（新版）新人教版.doc

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1透镜1.画出光经三棱镜 的大致光路图巩固练习(1)在方框内填入合适的透镜（2）练习三条特殊光线的基础作图。 课下作业1.上网，自学透镜的知识2.想想议议：你有几种简易的方法，辨别某一透镜是凸透镜，还是凹透镜？如何测量凸透镜的焦距？3.想想做做：早在古时人们就会用冰制作凸透镜取火.做法:取一块厚两厘米左右的冰，把冰周围磨薄，使中间突出，做成了凸透镜。

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