Mnemonic for Judging Vehicle Distance in Side Mirrors
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Mnemonic for judging vehicle distance in side mirrors: The smaller the rear vehicle appears, the safer it is; when the rear vehicle occupies 1/3 of the mirror, the distance is 10 meters; when it occupies 1/2, the distance is 7 meters - turning is acceptable; when the rear vehicle fills the entire mirror, the distance is 3 meters - turning is not advisable. Below is an introduction to rearview mirrors: 1. Structural principle of rearview mirrors: Rearview mirrors involve a field of vision issue, referring to the range the mirror surface can reflect. The industry proposes three elements of field of vision: the distance between the driver's eyes and the rearview mirror; the size of the rearview mirror; and the curvature radius of the mirror. These three elements are interrelated - with the same distance and size, a smaller curvature radius yields a larger reflected field. With the same curvature radius, a larger mirror size provides a greater reflected field. 2. Reflectivity index of rearview mirrors: Rearview mirrors also have a reflectivity index - higher reflectivity produces clearer images. Reflectivity depends on the reflective coating material on the mirror's inner surface.