What is the magnification produced by a rear-view mirror fitted in a vehicle?

The typical rear-view mirror in a vehicle produces a magnification of about 1 (i.e., unity magnification, the image size is nearly the same as the object size).

• A flat (plane) rear-view mirror is common in vehicles. A plane mirror produces an image same size as the object (magnification = +1, real size, virtual image behind mirror).
• If the mirror were convex (some side-mirrors are convex) then the image is reduced (magnification <1). But for standard inside rear-view one uses a plane mirror so magnification ≈1.

Thus the answer: magnification ≈1.