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The outer rearview mirror reflects the rear side of the car, the lower rearview mirror reflects the front and bottom of the car, and the inner rearview mirror reflects the rear of the car and the interior of the car. Different uses, mirror structure will be different. There are two main types of mirror surfaces in general rearview mirrors. One is a flat mirror. As the name implies, the mirror surface is flat. In terms of the term, it is "the surface curvature radius R is infinite". This is the same as the general household mirror, which can get the same image as the visual size. , This flat mirror is often used as an interior rearview mirror. The other is a convex mirror. The mirror surface is spherical and has different radii of curvature. Its image is smaller than that of the eye, but the field of view is large, like a camera "wide-angle mirror". This kind of convex mirror is often used as an exterior rearview mirror. and lower rear view mirror.