如图所示一束光线与主光轴平行且宽度为a照射到一个凹透镜上经过拆射后在距透镜l的光屏上形成一个宽度为b的光�则此凹透镜的焦距为alb Template




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tomski如图所示一束光线与主光轴平行且宽度为a照射到一个凹透镜上经过拆射后在距透镜l的光屏上形成一个宽度为b的光�则此凹透镜的焦距为alb coloring