The reflection shows characteristics of a convex surface, as evidenced by the nature of the reflected image.
Convex surfaces, such as those found in spherical mirrors, cause light rays to diverge upon reflection.
This divergence results in the formation of a smaller, upright, and virtual image that appears behind the surface.
The reflection seen in the image exhibits these traits: the image is diminished in size, upright, and does not appear to be inverted, which are typical behaviors when light is reflected off a convex surface.
These optical characteristics confirm that the surface in question is convex, as opposed to concave surfaces, which produce magnified or inverted images depending on the distance from the mirror.