give two examples of plane mirror
Answers
Most mirrors you see are in two types:
Big ones mounted on walls, wardrobe doors, etc. These usually approximate plane mirrors.
Every other mirror: makeup, car wing mirrors, the one in the picture above, telescope mirrors. They are all some form of spherical or parabolic surface.
The best approximation would be a pool of mercury. It’s far more reflective than water or any other liquid.
However, any mirror formed using a pool can’t be perfectly flat: they’re all formed in a near-spherical gravitational field, and so conform to that field.
The best glass-making technology we have works by floating the glass on another liquid, so it can’t be perfectly flat either.
So until someone comes up with a manufacturing method that can make perfectly even glass without floating it, there cannot be an example of a truly plane mirror.