The focus of a parabolic mirror as shown in figure is at a distance of 5 cm from its vertex. If the mirror is 45 cm deep, find the distance AB

Explanation

To solve the problem, we need to find the distance AB for a parabolic mirror where the focus is at a distance of 5 cm from its vertex and the mirror is 45 cm deep.

### Step-by-Step Solution:

1. **Understand the Geometry of the Parabola**:
The parabola opens to the right, and its vertex is at the origin (0, 0). The focus of the parabola is located at (a, 0), where 'a' is the distance from the vertex to the focus. Here, a = 5 cm.

2. **Write the Equation of the Parabola**:
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