What is the real depth of a swimming pool that appears to be 10 m for a swimmer? The refractive index of water is 1.33.

Explanation

To find the real depth of the swimming pool, we can use the relationship between the real depth (D_real), the apparent depth (D_apparent), and the refractive index (n) of the medium (water in this case). The formula we will use is:

\[ n = \frac{D_{real}}{D_{apparent}} \]

### Step-by-Step Solution:

1. **Identify the Given Values**:
- Apparent depth (D_apparent) = 10 m
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