The rules around this issue vary depending on where in the world you are however in the UK the DSA say that your vehicle must pass MOT in which the condition of mirrors and other safety equipment is required.
convex mirrors are used in vehicles because convex mirrors make things look bigger which will be easy for the drivers.
So. It can be read by drivers looking in there mirrors
Called side mirrors. Drivers side mirror/passenger side mirror.
All state laws require vehicles to have rear view mirrors (the ones that mount to the interior windshield).
That is so drivers in front of the emergency vehicle can read what it says in their rear view mirrors.
Plane mirrors don't distort the proportions or shape of the object in view, thereby allowing for simple and subconscious judgment of speed and distance.
convex mirror
closer than they appear
convex (curved) mirrors show more space than flat mirrors do also the images are smaller than they really are
curved mirrors are useful to driver to see what is in the back of them or use for seeing
They use convex mirrors to give a wider view.
Cars have always been the same regarding mirrors, check these out in order:- Electric mirrors, some switches on the drivers side should be able to control both of them- Newer manual mirrors, some inside rod you move makes the mirror move- Older manual mirrors, you directly move the mirror, by opening your window.