An EM wave from air enters a medium. The electric fields are →E1=E01^xcos[2πv(zc−t)] in air and→E2=E02^xcos[k(2z−ct)] in medium, where the wave number k and frequency v refer to their values in air. The medium is non-magnetic. If εr1 and εr2 refer to relative permitivities of air and medium respectively, which of the following options is correct?

An EM wave from air enters a medium. The electric fields are →E1=E01

1.	An EM wave from air enters a medium. The electric fields are →E1=E01^xcos[2πv(zc−t)] in air and→E2=E02^xcos[k(2z−ct)] in medium, where the wave number k and frequency v refer to their values in air. The medium is non-magnetic. If εr1 and εr2 refer to relative permitivities of air and medium respectively, which of the following options is correct?
Answer» An EM wave from air enters a medium. The electric fields are ${\to E}_{1} = E_{01}^x cos [2 π v (\frac{z}{c} - t)]$ in air and ${\to E}_{2} = E_{02}^x cos [k (2 z - c t)]$ in medium, where the wave number $k$ and frequency v refer to their values in air. The medium is non-magnetic. If $ε_{r_{1}}$ and $ε_{r_{2}}$ refer to relative permitivities of air and medium respectively, which of the following options is correct?

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