A ray of ordinary light is travelling in air. It is incident on air glass pair at a polarising angle of `56^@`. Find the angle of refraction in glass. 

Explanation

To find the angle of refraction in glass when a ray of ordinary light is incident at the polarizing angle, we can follow these steps:

### Step 1: Understand the relationship between the angles
The angle of polarization (denoted as \( \theta_p \)) is given as \( 56^\circ \). According to the laws of reflection and refraction, we have:

\[ \theta_p + \theta_r = 90^\circ \]
...