The lens described in the diagram appears to be a diverging lens (concave lens), which causes light rays to spread out or diverge.
The best application suitable for such a lens among the options provided is:
A flashlight that will allow light exiting the flashlight to reach a bigger area.
This option aligns with the characteristics of a diverging lens, as it is designed to spread light rather than focus it. The other options (binoculars, telescope, movie projector) typically involve converging lenses that focus light to create clear images.