What type of mirror is used for car rearview mirrors?
2 Answers
Car rearview mirrors use convex mirrors, except for the interior rearview mirror. The exterior rearview mirrors on both sides of the car are typically convex mirrors. These mirrors have a spherical surface with varying radii of curvature, producing a smaller image than the actual view but offering a wider field of vision, similar to a camera's "wide-angle lens" effect—hence they are also called wide-angle mirrors. Car rearview mirrors are located on both sides of the vehicle's front and inside the cabin. They reflect conditions behind, beside, and below the car, allowing the driver to indirectly observe these areas. Serving as "second eyes," they significantly expand the driver's field of vision. As critical safety components, the mirror surface, shape, and operation of rearview mirrors are carefully designed, and their quality and installation must comply with industry standards, leaving no room for compromise.
Most car rearview mirrors, especially the external side mirrors on both the left and right, use convex mirrors. This is because the curved design of convex mirrors provides a wider reflected field of view, helping to reduce blind spots—such as when reversing or changing lanes, allowing you to see more of the side traffic. Imagine driving on a highway: if the mirrors were flat, they would only show a limited range, making it easier to overlook cyclists or motorcyclists, significantly increasing risks. With over a decade of driving experience, I always emphasize the importance of rearview mirrors—they’re not just decorations but safety tools. It’s crucial to keep them clean to avoid fog or dirt obstructing visibility and to adjust their angles properly to maximize coverage. Some newer cars now integrate blind-spot monitoring systems, but the primary mirror surface remains convex. Maintaining this habit helps prevent accidents before they happen.
