Unpolarized light is incident on a plane surface of glass of refractive index `mu` at angle `i`. If the reflected light gets totally polarized, write the relation between the angle `i` and refractive index `mu`.

Explanation

To solve the problem, we need to establish the relationship between the angle of incidence \( i \) and the refractive index \( \mu \) when unpolarized light is incident on a plane surface of glass and the reflected light is totally polarized. We will use Brewster's Law to derive this relationship.

### Step-by-Step Solution:

1. **Understanding the Setup**:
- We have unpolarized light incident on a plane surface of glass with a refractive index \( \mu \).
- The angle of incidence is denoted as \( i \).

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