<span>Augustus’ statue is shown barefoot, wears no military boots even though he is wearing his full armor to go to the battlefield war, which indicates that he is a hero and since gods are depicted with bare feet, the missing detail indicated that he is god-like. </span>
I believe the correct answer is: material that the lens is
made from.
Lenses are engineered to have
specific focal lengths, besides the curvature of the two sides of a lens. The
focal range, the distance between your optic nerve and the retins in lens, of
the lenses is determined by the material that lenses are made from.