+) \(C=k\alpha+C_1\)
+) \(k=\dfrac{C_2-C_1}{\alpha_2-\alpha_1}\)
+) \(\alpha=a\alpha_1+b\alpha_2\)
Với \(\left\{\begin{matrix}a+b=1\\ \dfrac{1}{f^2}=\dfrac{a}{f_1^2}+\dfrac{b}{f_2^2}\end{matrix}\right.\)
\(C=\dfrac{\varepsilon S}{k4\pi d}\)
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