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Find the relative permittivity of the medium having a refractive index of 1.6(a) 0.4(b) 2.56(c) 3.2(d) 4.8This question was posed to me in final exam.My question is based upon S and P Polarised Waves topic in portion EM Wave Propagation of Electromagnetic Theory

Answer» RIGHT option is (b) 2.56

Easiest EXPLANATION: The refractive index is the square root of the RELATIVE permittivity. It is given by n = √εr. To GET εr, put n = 1.6. We get εr = n^2 = 1.62 = 2.56(no UNIT).


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