I believe it’s unified :)
Well my grandparents are coming and opening presents and I’m going to watch anime
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.
Microphones. As communities grew and gatherings became larger, the challenge was to create a device that would allow everyone to hear the performers.