v 4.25

\frac{E_{r 0}^{∥}}{E_{i 0}^{∥}} = - \frac{N_{21}^{2} \cos α - i \sqrt{\sin^{2} α - N_{21}^{2}}}{N_{21}^{2} \cos α + i \sqrt{\sin^{2} α - N_{21}^{2}}} \frac{E_{r 0}^{⊥}}{E_{i 0}^{⊥}} = \frac{\cos α - i \sqrt{\sin^{2} α - N_{21}^{2}}}{\cos α + i \sqrt{\sin^{2} α - N_{21}^{2}}}

${\frac{E_{r0}^\parallel}{E_{i0}^\parallel} = - \frac{N_{21}^2 \cos \alpha - i \sqrt{ \sin^2 \alpha - N_{21}^2}}{N_{21}^2 \cos \alpha + i \sqrt{\sin^2 \alpha - N_{21}^2}}\\ \frac{E_{r0}^\perp}{E_{i0}^\perp} = \frac{ \cos \alpha -i \sqrt{\sin^2 \alpha - N_{21}^2}}{\cos \alpha + i \sqrt{\sin^2 \alpha - N_{21}^2}}}$

Error