What lens has at least one inwardly curved surface, and is used to treat shortsightedness because its center is narrower than its corners?

A concave lens is a divergent lens, which means that light rays refracted through it are dispersed. Pliny the Elder's writings include what is likely the first usage of a concave lens as a corrective lens. According to Pilny, Emperor Nero used a concave-shaped emerald to watch gladiator games.

Asked by Vasilii Kulev · Last updated 3 years ago · 1.7K views · SOURCE