The wavelength of a certain light in air and in glass are `6400 Å` and `400 Å`, respectively, find the Brewster angle for the glass.

Explanation

To find the Brewster angle for glass given the wavelengths of light in air and glass, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Wavelengths**:
- Wavelength of light in air (\( \lambda_{air} \)) = 6400 Å
- Wavelength of light in glass (\( \lambda_{glass} \)) = 4000 Å

...