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, denoted as \( \theta_B \), is 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 Brewster's Law:**
According to Brewster's Law, when unpolarized light strikes a transparent medium, part of it is reflected and part is refracted. When the angle of incidence is equal to Brewster's angle, the reflected and refracted rays are perpendicular to each other.

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