Consider each of the electric- and magnetic-field orientations. a. what is the direction of propagation of the wave if e? =ei^,b? =? bj^. express the direction of the propagation vector, p? , as a unit vector. its three components should be entered in order (x, y,z) separated by commas. for example, if the wave propagates only in the -x direction, enter -1,0,0. < -- for all of themb. what is the direction of propagation of the wave if e? =ej^,b? =bi^. c. what is the direction of propagation of the wave if e? =? ek^,b? =? bi^. d. what is the direction of propagation of the wave if e? =ei^,b? =? bk^.