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Why is there a dotted line on the left rearview mirror?

2 Answers

LauraLynn

07/25/25 4:11pm

The reason for the dotted line on the left rearview mirror is: A typical dual-curvature rearview mirror has a dotted line at about one-third of the outer side of the mirror. The area outside the dotted line has a smaller radius of curvature, mainly used to observe situations farther away from the side of the vehicle. The area inside the dotted line has a larger radius of curvature, used to observe situations closer to the side of the vehicle. The combination of these two curvatures helps minimize blind spots in the rearview mirror. The benefits of having a dotted line are: the inner section has a normal curvature with less distortion, while the outer section has a larger curvature, expanding the field of view, primarily enhancing left and right visibility. The downside is the difference between the inner and outer sections, which may cause some people to feel dizzy, and the expanded field of view is mainly limited to the outer area.

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DanteLynn

08/11/25 9:43pm

I was once curious about why there's a dotted line on the left rearview mirror. After chatting with someone, I learned that it's designed to separate the main mirror from the wide-angle section. If the entire left mirror were made into a wide-angle type, it would cause too much image distortion, affecting the ability to judge distance. Therefore, only the outer half is given a convex magnifying effect, with the dotted line marking the boundary. This helps reduce blind spots, especially when changing lanes, allowing you to see more of the side traffic. I find it particularly useful in daily driving, especially on busy highways or city roads—it significantly improves safety and reduces the need to constantly turn my head to check. However, it's important not to rely on it too much; you still need to use the entire rearview mirror in combination. This small design tweak makes driving much more convenient and is a great example of modern safety details. I recommend everyone take the time to understand their car's rearview mirror design.

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