Term for the distance from the center of a lens to the pt. where parallel rays that pass through it converge
Since the actual rays of light passing through the lens form these real images,... [DOC] [TLE] The Thin Lens Equation and Magnification - Boundless [PAR] The thin lens equation relates the object distance d o, image distance d i, and ... 
A ray passing through the center of either a converging or a diverging lens does 
not ... A ray entering a converging lens through its focal point exits parallel to its 
axis.