How Does a convex lens invert images?

Question

(turn them upside down)

Answer 1

http://physics.bu.edu/py106/lens.gif

Answer 2

The curvature of the circular lens bends the light causing it to converge at a single point but then diverge upside down and also transposed left to right, etc.  The lens of a human eye inverts images and the brain must interpret them right side up and left to right, etc. to make sense of the world.  We must learn how to see correctly as infants.  In fact the left to right inversion may lead to a dominant eye to make sense of things and that may help lead to left or right handedness.