Why a parabolic mirror is preferred to an ordinary spherical mirror?

Explanation

### Step-by-Step Solution:

1. **Understanding the Types of Mirrors**:
- A spherical mirror is a mirror with a surface that is part of a sphere. It can be either concave or convex.
- A parabolic mirror, on the other hand, has a surface shaped like a parabola, which is a specific type of curve.

2. **Identifying the Problem with Spherical Mirrors**:
- When parallel rays of light (such as those from a distant source) strike a spherical mirror, they converge at a point called the focus.
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