consider the interface between a conductor and the air. this interface forms a flat surface in 2D parallel to the Z axis. In the diagram, we can see that the interface passes through the points (3,0,0) and (0,4,0). The origin is in the conductive region. the permittivity of the air is E₀.

a. determine the unit vector n that is normal at the interface in the dielectric region if the amplitude of component Y is E_y = 25V/m. in other words, use the conditions at the appropriate interfaces to determine the X and Z components of the electric field E = ( E_xx + 25y + E_zz)v/m

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