The field of Problem 3-1 is incident on a source which consists of the following surface electric current density, imposed on the z = 0 plane: a) Calculate the reaction of the field on this source, as...

The field of Problem 3-1 is incident on a source which consists of the following surface electric current density, imposed on the z = 0 plane:

a) Calculate the reaction of the field on this source, as a function of k_x.

b) Discuss, in particular, what occurs when k_x
= nπ/a, with integer n, and suggest a physical interpretation of these results.