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【单选题】
关于物和像，下列说法正确的是：（）A.
入射光是从物体上发出来的光线
B.
像点就是出射光线的会聚点
C.
一个理想成像光学系统对一个物点来说必定只有一个对应的像点
D.
因为光路是可逆的，所以一个像点同时也是一个物点
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