Show that fraunhofer diffraction patterns have a center of symmetry [i. e., (y, z) i( -y, -z)], regardless of the configuration of the aperture, as long as there are no phase variations in the field over the region of the hole. begin with eq. (10.41). we'll see later (chapter 11) that this restriction is equivalent to saying that the aperture function is real.

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.