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.
They use convex mirrors to give a wider view.
Called side mirrors. Drivers side mirror/passenger side mirror.
So. It can be read by drivers looking in there mirrors
Convex mirrors used in vehicles provide a wider field of view, allowing drivers to see a larger area behind them. This helps reduce blind spots and improve overall safety by enhancing visibility of surrounding traffic. Additionally, convex mirrors make objects appear smaller and may help drivers judge distances more accurately.
Passenger cars are required to have at least two mirrors: a rearview mirror and two side mirrors. The rearview mirror provides a view of the area behind the vehicle, while the side mirrors help in monitoring blind spots and surrounding traffic. Some vehicles may also have additional mirrors for enhanced visibility, but the minimum requirement is typically two side mirrors and one rearview mirror.
Curved mirrors, such as side mirrors and rear-view mirrors in cars, help drivers by providing a wider field of view, reducing blind spots, and enabling better visibility for parking and lane changes. They allow drivers to see objects and vehicles approaching from different angles, enhancing safety on the road.
All state laws require vehicles to have rear view mirrors (the ones that mount to the interior windshield).
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).
That is so drivers in front of the emergency vehicle can read what it says in their rear view mirrors.
Blind spot mirrors are small, convex mirrors that can be attached to side mirrors to enhance visibility and reduce blind spots. They provide a wider field of view, allowing drivers to see areas that standard side mirrors may miss. These mirrors are particularly useful for detecting vehicles or obstacles in adjacent lanes, improving overall safety while changing lanes or merging. Regularly checking blind spot mirrors can help prevent accidents caused by unseen vehicles.
Convex mirrors are used as rearview mirrors in vehicles because they provide a wider field of view compared to flat mirrors, allowing drivers to see more of the area behind them. The curved surface of a convex mirror reduces blind spots and diminishes the size of objects reflected, making it easier to spot approaching vehicles and pedestrians. Additionally, the image appears smaller and further away, which helps drivers gauge distances more effectively. This combination of benefits enhances overall safety while driving.
Convex mirrors are commonly found in stores, parking lots, and driveways as security or safety mirrors to provide a wider field of view for drivers and pedestrians. They are also used as rear-view mirrors in vehicles to reduce blind spots. Another example is in decorative or cosmetic mirrors due to their ability to make spaces appear larger.