A concave dome 
of radius a
and radius of curvature R
in an infinite baffle is shown in Fig. 12.30
. In this problem, we shall introduce the concept of coupling whereby
inside the imaginary sphere, which includes the space inside the dome, is coupled to an external field
. Again, the baffle can be removed so that we have an equivalent field which is symmetrical either side of the plane of the baffle. ...