It means that image formed same side object as same as object this statement verify that in plane mirror

It means the image formed by plane mirror is real ,similar to an object …

Soni suraj is ur real name
It means that the size of the image is equal to the size of the object. Positive sign indicates that the image is virtual and erect.

Shubhanshu u are also right
A plane mirror always form image which is same to size of object their for the magnification produced by a plane mirror is always one.if the size of image is bigger than object than it is said to be more than1 and if the image is smaller than object than it is said that it is in minus (-1) this criteria is used in concave and convex mirror commonly.
Am I right?
Image is virtual and erect

here + sign indicates that that the image is virtual and erect and 1 indicate that image is the same size of the object .
This means that the image formed by a plane mirror is the same size as the object and the same distance behind the mirror. Magnification produced by a plane mirror is +1 means the size of the image is. equal to the size of the object and the image is virtual. Thank you??