What is Brewster’s angle? Derive relation between Brewster angle and refractive index of medium which produces Plane Polarized light.

Explanation

### Step-by-Step Solution:

1. **Definition of Brewster's Angle**:
Brewster's angle (θ_B) is defined as the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection. At this angle, the reflected light is completely plane polarized.

2. **Understanding the Geometry**:
When light travels from a less dense medium (like air) to a denser medium (like glass), the angle of incidence (i) and the angle of reflection (r) are related. At Brewster's angle, the reflected light is polarized.

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