What is the purpose of the line on the rearview mirror?
2 Answers
The line on the rearview mirror is used to identify distance and position. Dual-curvature rearview mirrors are now a popular standard feature in new cars, functioning similarly to the small round mirrors that were previously attached to car rearview mirrors. The outer part has a large reflection angle, allowing for a view of more distant areas, while the inner part has a smaller angle, making it easier to identify distance and position. Design principle of the rearview mirror line: There is a black dotted line at the outer third of the rearview mirror serving as a boundary. The right side is a flat mirror, and the left side is a convex mirror. This design can double the field of view while maintaining minimal distortion and eliminate blind spots during turns, enabling the driver to see a panoramic view behind the car.
The line on the rearview mirror is actually a heating wire, specifically designed to defog and defrost. As a driver, I find rainy days and winter the most annoying, as the rearview mirror often gets foggy, making it impossible to see the vehicles behind. Once when it snowed, the mirror surface froze over, but turning on the rearview mirror heating function cleared it up in just a few minutes. The principle is quite simple: an electric heating wire is embedded in the back of the glass, connected to the car's power supply to generate heat and evaporate water droplets and fog. Most cars nowadays come with this feature, usually with a button located near the air conditioning panel, marked with a rectangle and wavy arrows. I recommend turning it on before heading out in overcast or rainy weather to avoid obstructed vision while driving. However, note that this function has low power and isn't very effective at melting thick ice, so it's best to use a windshield washer to rinse off hardened ice first.
