When unpolarised light is incident on the interface separating the rarer medium and the denser medium, Brewster angle is found to be `60^(@)` . Determine the refractive index of the denser medium.

Explanation

To determine the refractive index of the denser medium when the Brewster angle is given, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Brewster's Law**: Brewster's angle (θ_B) is the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection. The relationship between the Brewster angle and the refractive indices of the two media is given by:
\[ \tan(\theta_B) = \frac{n_2}{n_1} \]
...