The distance between the object and its image formed by a plane mirror appears to be 18 cm. What is the distance between mirror and the object?
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9 cm because whatever the distance is between mirror and the object,the same distance mirror will copy and it will show its double. So the distance between mirror and the object will be total distance must be divided by 2.
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For example, if we stand at a distance of 2 meters from a plane mirror, we must focus at a location 2 meters behind the mirror in order to view our image. In this case, the distance between the object and its image formed by a plane mirror appears to be 24 cm. So, the object distance will be 24 / 2 = 12 cm.
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