Convex mirrors can only produce virtual images because the focal point and the center of curvature of the convex mirror are imaginary points and that cannot be reached.
<h3>What is virtual image?</h3>
This is referred to the opposite of a real image and cannot be obtained on a screen. It is formed from the apparent divergent of light rays from a point and not the actual one which is the major difference it has with a real image.
It is usually produced by a convex mirror because the focal point and the center of curvature of the convex mirror are imaginary points which can't be reached.