如图所示小丽同学将一个凸透镜正对太阳光再把一张纸放在它的另一侧改变透镜与纸的距离直到纸上出现一个最小最亮的光�这表明凸透镜对光线有 Template




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tomski如图所示小丽同学将一个凸透镜正对太阳光再把一张纸放在它的另一侧改变透镜与纸的距离直到纸上出现一个最小最亮的光�这表明凸透镜对光线有 coloring