Why does a lens magnify? Why does it shrink objects? Why does this happen? The activities that we propose here are useful in helping us to understand how lenses work, and they show that the same lens can have different magnification capabilities. A converging lens can also act as a diverging lens.
Converging or Diverging Lens?" / BRANCA M. - In: THE PHYSICS TEACHER. - ISSN 0031-921X. - 51:(2013), pp. 86-86.