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如图所示，李宁同学在张老师指导下做“探究凸透镜成像规律”的实验． （1）当蜡烛位于图中B处时，移动光屏到D处，观察到光屏上呈现清晰的像，此时像和物大小相等，则该凸透镜焦距为 cm． （2）李宁...
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教案备课库《2017年江苏省淮安市中考物理模拟试卷》真题及答案
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