凹面镜,凹透镜,凸面镜,凸透镜,谁透光,谁聚光?受不受光源的影响? 知乎 Template




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tomski凹面镜,凹透镜,凸面镜,凸透镜,谁透光,谁聚光?受不受光源的影响? 知乎 coloring