1由图可知凸透镜的焦距为 Cm.2当烛焰距凸透镜30cm时移动光屏可在光屏上得到一个倒立 的实像.该原理可应用于 填“照相机 Template




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tomski1由图可知凸透镜的焦距为 cm.2当烛焰距凸透镜30cm时移动光屏可在光屏上得到一个倒立 的实像.该原理可应用于 coloring