The title says it all.
I always wondered how does pushing that little button on the bottom of the mirror dim the reflected lights at night and yet keeps the same viewing angle.
In: 10
[https://driving.ca/auto-news/news/how-it-works-mirrors](https://driving.ca/auto-news/news/how-it-works-mirrors)
There is electrochromatic gel sandwiched between two pieces of glass in front of the mirror surface (mirror surface is usually made of aluminum or silver) so the mirror goes like this: Mirror metal film -> glass -> electrochromatic gel film -> glass.
The electrochromatic film is basically what the name says, when electricity (in your car’s example DC current) is applied to the gel, it produces color that interferes with how much light gets to the mirror and then again how much light reflects from the mirror reducing the intensity and glare.
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