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A medium is divided into regions I and II about $x=0$ plane, as shown in the figure below. An electromagnetic wave with electric field $\mathrm{E}_{1}=4 \hat{a}_{x}+3 \hat{a}_{y}+5 \hat{a}_{z}$ is incident normally on the interface from region-I. The electric field $E_{2}$ in region-II at the interface is

1. $\mathrm{E}_{2}=\mathrm{E}_{1}$
2. $4 \hat{a}_{x}+0.75 \hat{a}_{y}-1.25 \hat{a}_{z}$
3. $3 \hat{a}_{x}+3 \hat{a}_{y}+5 \hat{a}_{z}$
4. $-3 \hat{a}_{x}+3 \hat{a}_{y}+5 \hat{a}$