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The reflection coefficient of a wave travelling through two media having permittivities 4 and 9 respectively is(a) 0(b) 0.5(c) 0.25(d) 0.2This question was posed to me in an interview.This is a very interesting question from Reflection and Transmission Coefficients in division Transmission Lines of Electromagnetic Theory

Answer»

The correct choice is (d) 0.2

For EXPLANATION: The reflection COEFFICIENT in terms of permittivity is given by R = √ε2 – √ε1/√ε2 + √ε1. On substituting for ε1 = 4 and ε2 = 9, we GET R = 3 – 2/3 + 2 = 1/5 = 0.2.



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