What is the principle of convex mirrors in car rearview mirrors?

[MacAdelyn]

Mirror surface is spherical with varying radii of curvature, producing smaller images than actual vision but offering a wider field of view. Here are relevant explanations: 1. Safety equipment: Car rearview mirrors are primary safety devices ensuring safe driving, yet all types installed on vehicles (flat mirrors or spherical convex mirrors) have blind spots to varying degrees and insufficient field width. Drivers often need to lean forward or turn their heads sideways to detect obstacles when turning, changing lanes, overtaking or being overtaken. This consistently creates potential safety hazards for driving. 2. Visual habits: Normally, flat mirrors are installed as car rearview mirrors, which show objects without distortion and conform to human visual habits.