Why do the mirrors in some clothing stores look so thin?

The principle is basically the same as that of "ha ha mirror", but to a lesser extent.

Thin mirrors use the principle of optical refraction. Anyone with a little physical knowledge knows that when the mirror has a certain curvature, the imaging of the human body when looking in the mirror will be "distorted". The portrait illuminated by the convex mirror will have an expansive effect visually, that is, it will look fat. On the contrary, the portrait taken by concave mirror looks thinner.

The mirror that can make people thin is actually a haha mirror, but the deformation degree is smaller. So in theory, it is not difficult to make a slim mirror, as long as the shape of the mirror is slightly changed.

Extended data:

Precautions:

Bottom mirror concave mirror

It is precisely because of the different convex and concave parts of the mirror that some images are enlarged and some images are reduced. For example, when watching concave mirror, enlarge your head, because facing the protruding nose and being close to the mirror, the nose is an enlarged image than any other part of the face, which leads to a bigger nose.

Convex mirror with ha ha mirror

If you look at a mirror with a convex cylinder at the top, the image in the vertical direction is the same as the length of the object, but it is convex in the horizontal direction and looks contracted, so the image of the face in the mirror is elongated. Similarly, if you look at your face in the concave mirror, you will see a short and fat face.

If the mirror is made concave, people's heads will be small and their bodies will be big. The mirror is concave and convex, with a big head and a small body. If every part of the mirror is uneven, then the image taken is crooked and ugly.