\(\tan \alpha = \frac{1}{2}\tan \frac{\pi }{3}\)
\(==>\) \(\alpha = {\tan ^{ - 1}}\frac{{\sqrt 3 }}{2}\)
\(\theta = \frac{\pi }{3} + {\tan ^{ - 1}}\frac{{\sqrt 3 }}{2}\)
[Given : Permittivity of vacuum $\left.\epsilon_{0}=8.85 \times 10^{-12} C ^{2} N ^{-1}- m ^{-2}\right]$