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

An EM wave from the air enters a medium. The electric field are −→

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

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