We know that $\theta = \phi + \theta_{i1}$ and $\theta_{r2} = \alpha + 30^\circ$. Therefore, we can express $\phi$ and $\alpha$ in terms of $\theta_{i1}$ and $\theta_{r2}$ respectively as follows:
\[\phi = \theta_{i1} - 30^\circ\]
\[\alpha = \theta_{r2} -
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