The mirror is convexed so it sees a larger area. If you see a larger area in the same size mirror then it is reasonable to understand that things are smaller which corresponds to further away. So, you must mentally realize that they are closer.
Perspective.
The answer is Linear Perspective.
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telescope
Light refracting through the water acts like a magnifying glass.
why yes, yes they do.
farther away, for example the rear view mirrors in your car have a print on them saying "objects in mirror are closer than they appear"
On a mirrors that say "objects may appear closer than they seem" have a greater field of view then a conventional flat mirror. If you look at it very closly you will notice it is slightly convexed, much like a fisheye lens.
closer than they appear
Car rear view mirrors carry a warning message that states objects in the rear view mirror are closer than they appear because this is true. When looking into a rear view mirror, distance is added to the rear view. The warning is there for protective measures.
Convex mirrors are often used for side mirrors (if the mirror has a note saying "objects in mirror are closer than they appear," it's convex; it may be convex even without such a note).
Convex mirror is curved outward so that it reflects a wider viewing area. The images reflected in convex mirror appear smaller and closer.Convex mirrors are generally labeled with safety warning "Objects in mirror are closer than they appear", to warn the driver to be cautious while driving.
Convex is () and makes objects appear larger. Concave is )( and makes objects appear smaller. The side rear-view mirrors on cars have concave mirrors, hence, "Object are closer than they appear." Easy way to remember is that a cave is like a hole in the ground, so something is concave if it gets smaller towards the center.
A telescope.
The cast of Objects in Mirror Are Closer Than They Appear - 2008 includes: Zay Nuba
Objects in the Rear View Mirror May Appear Closer than They Are was created in 1994.
Objects in Mirror Are Closer Than They Appear - 2010 was released on: USA: 18 April 2012