*해설

<문제 해설>
고유임피던스 Z01= E1/H1 = √(μ1/ε1) =√(μs1μ0/εs1ε0) = 377√(μs1/εs1) = 377√(1/4) =188.5[Ω]
고유임피던스 Z02= E2/H2 = √(μ2/ε2) =√(μs2μ0/εs2ε0) = 377√(μs2/εs2) = 377√(1/9) =125.67[Ω]
반사계수 R = (Z02-Z01)/(Z02+Z01) = (125.67-188.5)/(125.67+188.5) = -0.2