1. If you stand with your legs in the same position and in the center of the mirror, you can see the whole body (hands, feet, face) with a width of at least 65438+ 0.2 of your wingspan (half of your height).
2. If it is high, it can be 40cm above the ground, that is, the height is -40cm.
It has nothing to do with how far you are from the mirror.