Two homogeneous isotropic dielectrics meet on plane x=0. For x > 0, Er1=6 and for x<0, Er2=3. A uniform electric field E1=3ax-2ay+5az V/m exists for x >0. Find:
a) E2 for x<0
b) The angles E1 and E2 make with the interface
c) The energy densities in J/m3 in both dielectrics
d) The energy within a cube with side 1m centered at (1,2,3)