Unpolarized light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to eachother ?

Explanation

To solve the problem of finding the angle of incidence so that the reflected and refracted rays are perpendicular to each other when unpolarized light is incident on a plane glass surface, follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**: We need to find the angle of incidence (denoted as \( I \)) at which the reflected ray and the refracted ray are perpendicular to each other. This means that the angle between these two rays is \( 90^\circ \).

2. **Using the Condition for Perpendicular Rays**: The condition for the reflected and refracted rays to be perpendicular is that the angle of incidence should be equal to the polarizing angle (\( I_p \)).

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