Question 119 of 165

An EM wave from air enters a medium. The electric fields are ${\vec{E}}_{1}={E}_{01}\hat{x}\cos ⁡\left[2\pi v\left(\dfrac{z}{c}-t\right)\right]$ in air and ${\vec{E}}_{2}={E}_{02}\hat{x}\cos ⁡\left[k\left(2z-ct\right)\right]$in medium, where the wave number k and frequency $v$ refer to their values in the air. The medium is non-magnetic. If ${ϵ}_{{r}_{1}}$ and ${ϵ}_{{r}_{2}}$ refer to relative permittivities of air and medium respectively, which of the following options, is correct?