Drag
Object
2F
F
Focal
Point
Focal
Point
Optical
Center (O)
Bi-Convex
Lens
F'
2F'
Principal Axis
1 / q = 1 / f - 1 / p
Object
2F
F
Focal
Point
Focal
Point
Optical
Center (O)
Bi-Convex
Lens
F'
2F'
Principal Axis
1 / q = 1 / f - 1 / p