放在凸透镜主轴上焦点以内的点光源s�出的光通过凸透镜后的光路如图所示.则下列说法正确的是 A.凸透镜可以对光线起会聚作用b.凸透镜只对 Template




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tomski放在凸透镜主轴上焦点以内的点光源s�出的光通过凸透镜后的光路如图所示.则下列说法正确的是 a.凸透镜可以对光线起会聚作用b.凸透镜只对 coloring