Why your car's rearview mirror has a mysterious tab at the bottom
In short: That small tab on your rearview mirror is more than a decorative feature. It is a simple mechanical switch that changes how the mirror reflects light, helping you manage glare while driving at night. This video explores the science behind this common but often misunderstood automotive tool.
The rearview mirror is designed with two distinct levels of reflection. By flipping the tab, you physically adjust the mirror's angle relative to your line of sight, allowing you to switch between a standard reflective mode and a dimmed setting.
This mechanism relies on the geometry of the mirror's glass to reduce the intensity of light hitting your eyes from vehicles behind you. Understanding this simple optical trick makes night driving significantly more comfortable and safer.
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- Summary by Intellect · source: What Do Those Tabs On Rearview Mirrors Actually Do?
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