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The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is

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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) 5

The 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

1 Answer

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Best 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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