A mirror in the bathroom or in the living room, it will increase the light and the perception of space.
Use the mirrors to open a space and make it look bigger, and make sure the mirror reflects something evocative to the eye: an attractive chandelier in the living room; a landscape, which will bring the vibrant energy of a garden ...
Mirrors have many curative uses. Mirrors must not distort or cut the image of a person ...
Mirrors are useful in small spaces where it appears to double the size of the area. Large mirrors will make a room look much bigger.
Increase light
They are also useful in dark spaces where you want to reflect as much of the backlight that is available in the room as possible. This applies to basement apartments or a room that only receives northern light. You can strategically place a mirror so that natural light from a window reflects off a dark area of the room or a stagnant corner.
More information-Decorate the house with mirrors
Source- Mirror decoration