Answer:
i don't know either.........
During the renaissance artists painted or sculpted the art to look similar to everyday lives of people.
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.
