With a plane mirror, the distance of the image behind the mirror is infinitely far. The greatest distance behind the mirror at which the image can be found is infinite.
For plane mirrors, the object distance is equal to the image distance and hence, the image is the same distance behind the mirror as the object is in front of the mirror.
The image distance from mirror does not depend on the distance of the observer from mirror. Therefore, if we change the object's distance then only the image distance or distance between object and image will be affected.
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