If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

Explanation

To find the focus of the parabolic reflector given its dimensions, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Geometry of the Parabola**:
- The reflector is a parabola that opens sideways. The standard equation of such a parabola is \( y^2 = 4ax \), where \( a \) is the distance from the vertex to the focus.

2. **Identify the Dimensions**:
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