Specifically, suppose that the plane wave is propagating in the z direction, the photographic plate is in the x-y plane at z=z0 and we put the origin of our coordinate system at t...Specifically, suppose that the plane wave is propagating in the z direction, the photographic plate is in the x-y plane at z=z0 and we put the origin of our coordinate system at the position of the source of the spherical wave, as shown in Figure 13.34. The converging spherical wave shown in Figure 13.36 is much stronger than the rest of the wave disturbance at the focus, z=2z0, x=y=0, because the amplitude of this part of the wave
