Usually as we say the details of the image we point out their, size, position, type and nature.
In case of plane mirror,
size = same size of the object
position = at the same distance as the object is in front of the mirror
type - erect one
nature - virtual image. This means could be seen but not be caught on a screen.
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In 'a' plane mirror only 'one' image is formed.
virtual :-)
The distance of the object from the mirror line should equal the distance of the image from the mirror line.
same distance
The answer is 15 millimeters behind the mirror, and the distance from the actual object to the image is 30 millimeters. Plane mirrors have a flat focus that places the image as far behind the mirror as you are in front of it.