Miscellaneous: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Miscellaneous. Understanding the underlying formula is key to arriving at the correct answer below:

Brewster's law states \(tan\theta = \mu\). Since the refractive index of any medium with respect to air is \(\mu > 1\), we have \(tan\theta > 1 \implies \theta > 45^\circ\). Thus, \(45^\circ < \theta < 90^\circ\).