Question

How does image changes when the face is slowly moved away from inner face of a shinning spoon.

Answer 1

Because of reflection

Answer 2

Unlike a flat mirror, the curved surface of the spoon's bowl bounces incoming rays back towards a central focus point lying between your face and the center's of the spoon. In passing through this point, rays from the upper part of your face are reflected downward, while those from the lower part are reflected upward. The result is an upside down image of our face.