Based on your description of the lens causing light rays to expand in different directions, the best application suited for such a lens would be:
A flashlight that will allow light exiting the flashlight to reach a bigger area.
This option indicates that the lens is likely a type that diverges light beams, which is typically used to spread light over a larger area, such as in a flashlight. The other options are generally associated with lenses that converge light, such as in projectors, telescopes, and binoculars.