When light of particular wavelength falls on a plane surface at an angle of incidence `60^(@)` then the reflected light becomes completely plane polarized Find the refractive index of surface material and the angle of refraction through it.

Explanation

To solve the problem, we will use Brewster's Law, which states that when light is incident at the Brewster angle (θp), the reflected light is completely polarized. The relationship between the angle of incidence (θi), the Brewster angle (θp), and the refractive index (n) of the material is given by:

\[ n = \tan(\theta_p) \]

### Step-by-Step Solution:

1. **Identify the Given Information:**
- Angle of incidence (θi) = 60°
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