如图所示一束平行于凸透镜的主光轴的光线经过凸透镜后在光屏上形成一个最小最亮的光�.1由图可知凸透镜对光线具有 作用该凸透镜的焦距 Template




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tomski如图所示一束平行于凸透镜的主光轴的光线经过凸透镜后在光屏上形成一个最小最亮的光�.1由图可知凸透镜对光线具有 作用该凸透镜的焦距 coloring