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The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is(a) 0(b) 1(c) 10(d) 5The question was posed to me during an online exam.This intriguing question comes from S and P Polarised Waves topic in section EM Wave Propagation of Electromagnetic Theory

Answer»

The correct option is (B) 1

Easiest explanation: The transmission coefficient is the ratio of the transmitted ELECTRIC field to the incident electric field. Thus T = Et/Ei. On SUBSTITUTING for Et = 5 and Ei = 5, we get T = 5/5 = 1(no unit). Simply, when the incident and transmitted field are same, no REFLECTION OCCURS and the transmission is unity.



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