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r_{||} = \frac{\eta\cos\theta_i - \cos\theta_t}{\eta\cos\theta_i + \cos\theta_t}
a_n = \frac{n!}{\sqrt{2\pi}n^{n+1/2}e^{-n+1/(12n)}}\\
b_n = \frac{n!}{\sqrt{2\pi}n^{n+1/2}e^{-n}}
\phi(\overline{X}_n)\equiv\left\{\begin{array}{cc} 1 & \mu\in I(\overline{X}_n)\\ 
                                 0 & \mu\notin I(\overline{X}_n)\end{array}\right.
P\left(\left|\displaystyle\frac{\sqrt{n}(\overline{X}_n - \mu)}{\tilde{\sigma}_n}\right|<t(n-1, \alpha / 2)\right)=1-\alpha\\
X_i