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A monochromatic plane wave of wavelength $\lambda = 600 \mu m$ is propagating in the direction as shown in the figure below. $\vec{E_{i}},\vec{E_{r}},$ and $\vec{E_{t}}$ denote incident, reflected, and transmitted electric field vectors associated with the wave.

The expression for $\vec{E_{r}}$ is

- $0.23\frac{E_{0}}{\sqrt{2}}(\hat{a_{x}} + \hat{a_{z}})e^{-j \frac{\pi\times 10^{4}(x-z)}{3\sqrt{2}}} \:V / m$
- $-\frac{E_{0}}{\sqrt{2}}(\hat{a_{x}} + \hat{a_{z}})e\:^{j \frac{\pi\times 10^{4}z}{3}} \:V / m$
- $0.44\frac{E_{0}}{\sqrt{2}}(\hat{a_{x}} + \hat{a_{z}})e^{-j \frac{\pi\times 10^{4}(x-z)}{3\sqrt{2}}} \:V / m$
- $\frac{E_{0}}{\sqrt{2}}(\hat{a_{x}} + \hat{a_{z}})e^{-j \frac{\pi\times 10^{4}(x+z)}{3}} \:V / m$