Question

The magnification produced by a plane mirror is +1. What does this mean?

Answer 1

it means that height of object is equal to the height of the image formed....

Answer 2

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 and sign indicates that the image is erect with the image is erect and size of the image is equal to size of the object.

In optics, we state that the image in a plane mirror is equidistant to that of the object as measured from the mirror.