What is the angle of incidence when incident Ray is normal to the interface between the 2 media?

Explanation

To determine the angle of incidence when the incident ray is normal to the interface between two media, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept of Angle of Incidence**:
The angle of incidence is defined as the angle formed between the incident ray and the normal to the surface at the point of incidence. The normal is an imaginary line that is perpendicular to the surface at the point where the ray strikes.

2. **Identifying the Position of the Incident Ray**:
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