If the radius of curvature of a concave mirror is 22 cm, what would be its focal length?

Answer

To find the focal length of a concave mirror given its radius of curvature, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Information**:
- The radius of curvature (R) of the concave mirror is given as 22 cm.

2. **Recall the Formula**:
- The relationship between the focal length (F) and the radius of curvature (R) for a concave mirror is given by the formula:
\[ F = \frac{R}{2} \]

3. **Substitute the Given Value**:
- Substitute the value of R into the formula:
\[ F = \frac{22 \, \text{cm}}{2} \]

4. **Perform the Calculation**:
- Calculate the focal length:
\[ F = 11 \, \text{cm} \]

5. **State the Final Answer**:
- The focal length of the concave mirror is 11 cm.

### Final Answer:
The focal length of the concave mirror is 11 cm.

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