If you take a photograph of your image in a plane mirror, how many meters away should you set your focus if you are 2m in front of the mirror?
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Solution
Image formed by the plane mirror is always virtual, upright is at the same distance from the mirror as is the object and is same shape and size as that of the object.
Total distance between object and distance = 2+2 = 4m
Since image is 4 m away from object so we should set the focus of camera at 4 m.