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(B) The object $O$ is placed between two parallel mirrors $AB$ and $CD$. Each mirror forms an image of the object $O$ behind it. Since the mirrors are

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(B) The object $O$ is placed between two parallel mirrors $AB$ and $CD$. Each mirror forms an image of the object $O$ behind it. Since the mirrors are not facing each other (they are arranged along parallel lines but are offset),light rays from the object $O$ can reflect off mirror $AB$ to form an image $I_1$,and light rays can reflect off mirror $CD$ to form an image $I_2$. Because the mirrors do not overlap in the field of view of the reflected rays from the other mirror,no further multiple reflections occur. Therefore,only two images are formed,one by each mirror.

Two mirrors $AB$ and $CD$ are arranged along two parallel lines as shown in the figure. The maximum number of images of object $O$ that can be seen by any observer is

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