Imaging Property of a Lens. Show that a paraboloidal wave centered at the point Pi (Fig. 2.4- 10) is converted by a lens of focal length f into a paraboloidal wave centered about P2, where 1/z1 1/22 1/f (this is known as the imaging equation). Figure 2.4-10 A lens transforms a paraboloidal wave into another paraboloidal wave. The two waves are centered at distances that satisfy the imaging equation 21