Answer Happy

Suppose we have a thin double-convex lens (also called a spherical lens) with surface radii given by R, and R2 as shown (remember by convention, Ry is positive and R2 is negative if they are convex) in air. The thickness A is negligible. (-R2) R دح
= R2) (b) Suppose a paraboloidal wave U(x, y, z) traveling in the +z direction originates from the position (x, y, z) = (0,0, zo), where |U(x, y, z)| = Ao at z = zo +1. Write an expression for the complex amplitude U(x, y, z) of the wave in the region z > zo. =