The Brewsters angle ibi_bib for an interface should be
0∘^{\circ}∘ < ibi_bib < 30∘^{\circ}∘
30∘^{\circ}∘ < ibi_bib < 45∘^{\circ}∘
45∘^{\circ}∘ < ibi_bib < 90∘^{\circ}∘
ibi_bib = 90∘^{\circ}∘
μ=tanib\mu = \tan i_bμ=tanib. Since 1<μ<∞1 < \mu < \infty1<μ<∞, then 1<tanib<∞1 < \tan i_b < \infty1<tanib<∞, which implies tan−1(1)<ib<tan−1(∞)\tan^{-1}(1) < i_b < \tan^{-1}(\infty)tan−1(1)<ib<tan−1(∞), so 45∘<ib<90∘45^{\circ} < i_b < 90^{\circ}45∘<ib<90∘.
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