An EM field is normally incident on a slab with relative permittivity 25 and relative permeability 1. (a) Using the Fresnel coefficients and the impedance, determine the transmittance of E, H, and intensity fields relative to the incident fields. [4 marks] (b) Using the transmittance and physical reasoning (do not use the Fresnel coefficients for reflectance), determine the reflectance of E, H and intensity fields relative to the incident fields. Be sure to explain your reasoning. [4 marks]