What will be the nature of a spherical mirror and a thin spherical lens if both have negative focal length ?

Explanation

To determine the nature of a spherical mirror and a thin spherical lens when both have negative focal lengths, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Focal Length**:
- The focal length (f) of a mirror or lens indicates where parallel rays of light converge or appear to diverge. The sign of the focal length helps us identify the type of mirror or lens.

2. **Spherical Mirror Analysis**:
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