A ray of light is incident on the surface of water. For what angle, the ray will undergo total internal reflection ?

Explanation

To determine the angle at which a ray of light will undergo total internal reflection when it is incident on the surface of water, we need to understand the conditions required for total internal reflection (TIR) to occur.

### Step-by-Step Solution:

1. **Understanding Total Internal Reflection (TIR)**:
- Total internal reflection occurs when a light ray travels from a denser medium to a rarer medium and the angle of incidence exceeds a certain critical angle.

2. **Identify the Media**:
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