What is the function of car rearview mirror?

The rearview mirror reflects the rear, side and bottom of the car, allowing the driver to see these positions indirectly. It acts as the "second eye" and broadens the driver's vision. The rearview mirror is divided into external rearview mirror, lower rearview mirror and internal rearview mirror according to the installation position. According to the purpose, the external rearview mirror reflects the rear side of the car, the lower rearview mirror reflects the front and lower side of the car, and the internal rearview mirror reflects the rear and interior of the car. For different purposes, the mirror structure will be different. There are two main types of rearview mirrors. One is a plane mirror, which is flat as its name implies, and is represented by "the radius of curvature of a surface is infinite". This is the same as the general household mirror, which can get the same visual size image. This kind of flat mirror is often used as an interior rearview mirror. The other is a convex mirror, which is spherical and has different radii of curvature. Its image is smaller than that of visual inspection, but its field of view is large, just like the role of a camera "wide-angle mirror". This convex mirror is often used as an outer rearview mirror and a lower rearview mirror.

First, judge the distance behind the car when overtaking and changing lanes: the relationship between the size of the car shadow in the rearview mirror and its distance is as follows: 1, and the car shadow accounts for all rearview mirrors-the distance is 3 m; The car shadow accounts for 2/3 of the rearview mirror-the car distance is 5m3, and the car shadow accounts for1/2-the car distance of the rearview mirror is 9m.

Second, how to judge the distance in front of the car when the traffic jam follows the car: the distance from the car is generally about 2 meters. If it is too close, it will easily lead to a rear-end collision. If it is too far, it will be cut in line by other vehicles. Generally, it is judged according to the position of the front bumper and tire seen by the driver from the front contour line of the vehicle:

1. See the upper edge of the front bumper-vehicle distance1m; ;

2. See the lower edge of the front bumper-the distance between cars is 2m;

3. Look at the lower edge of the front and rear tires-the distance between cars is 3m.