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

Magnification produced by a mirror is given by the relation

Magnification, m = Image height (H₁) / Object height (H0)
The magnification produced by a plane mirror is +1. It shows that the image formed by the plane mirror is of the same size as that of the object. The positive sign shows that the image formed is virtual and erect.

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