A uniform plane wave in air with E;$($z$)=$ axE$0$ exp $($ j$(50$z$)$ impinges normally onto the surface at z $=0$ of a highly conducting medium having constitutive parameters e$0,$ n$,$ and a $\{$a$/$coe$01).$ a$)$ Find the reflection coefficient. b$)$ Derive the expression for the fraction of the incident power absorbed by the conducting medium. c$)$ Obtain the fraction of the power absorbed at $1($MHz$)$ if the medium is iron.