Which of the following is true about the focal length of a spherical mirror ?

Options

A. It is equal to its radius of curvature
B. It is equal to half its radius of curvature
C. It is equal to twice its radius of curvature
D. None of the above

Explanation

To determine which statement is true about the focal length of a spherical mirror, we need to understand the relationship between the focal length (f) and the radius of curvature (R) of the mirror.

### Step-by-Step Solution:

1. **Understanding the Definitions**:
- The **focal length (f)** of a spherical mirror is the distance from the mirror's surface to its focal point, where parallel rays of light either converge or appear to diverge from.
- The **radius of curvature (R)** is the radius of the sphere from which the mirror is a part.

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