Because they give a more "wrap around" view, thus cutting down on blind spots.
Concave mirrors are used in telescopes. Convex mirrors are used as side-view mirrors in cars.
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).
Most motorcycles use convex mirrors because they provide a wider field of view, making it easier for the rider to see vehicles approaching from behind. Concave mirrors would distort the image and make objects appear smaller than they actually are.
Convex mirrors
convex mirror
Convex mirrors diverge light rays, making objects appear smaller and upright. They have a wider field of view compared to flat or concave mirrors. Convex mirrors are commonly used in rear-view car mirrors to provide a wider perspective of the surroundings.
Convex mirrors make things appear smaller as they produce virtual and diminished images. An example of where convex mirrors are used is in side-view mirrors in cars to provide a wider field of view for the driver.
To give a wider angle of view.
Concave mirrors are used in reflecting telescopes, makeup mirrors, and headlights to focus light rays. Convex mirrors are used in security mirrors, wide-angle rearview mirrors in cars, and magnifying glasses to provide a wider field of view or to reduce image distortion.
Not sure about mirrors but convex and concave lenses are used to treat conditions such as long/short sightedness.
Concave mirrors are used to focus light, to produce a parallel beam in car headlights, and so you can have a close look while shaving. Convex mirrors are used for making telescopes, viewfinders in vehicles, and used in supermarkets or stores as surveillance as it gives a wider view.
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.