Reflection coefficient of plane waves with normal incidence in terms of impedances of medium is ____(a) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)(b) \(γ_r=\frac{2η_2}{η_2+η_1} \)(c) \(γ_r=\frac{2η_1}{η_2+η_1} \)(d) \(γ_r=\frac{η_2+η_1}{η_2-η_1} \)The question was posed to me in examination.My doubt is from Radio Wave Propagation topic in portion Radio Wave Propagation of Antennas

Reflection coefficient of plane waves with normal incidence in terms o

1.	Reflection coefficient of plane waves with normal incidence in terms of impedances of medium is ____(a) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)(b) \(γ_r=\frac{2η_2}{η_2+η_1} \)(c) \(γ_r=\frac{2η_1}{η_2+η_1} \)(d) \(γ_r=\frac{η_2+η_1}{η_2-η_1} \)The question was posed to me in examination.My doubt is from Radio Wave Propagation topic in portion Radio Wave Propagation of Antennas
Answer» The CORRECT choice is (a) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \) The best I can explain: The reflection FACTOR is GIVEN by the ratio of Reflected wave to incident wave. \(ρ=\frac{reflected\, wave}{incident\, wave}=\frac{E_r}{E_i} \) Reflection coefficient of plane waves with NORMAL INCIDENCE in terms of impedances of medium is \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)

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