Power of which lens is negative ? Also give the relation between focal length and power of a lens

Explanation

### Step-by-Step Solution:

1. **Understanding Power of a Lens**:
The power of a lens (P) is defined as the ability of the lens to converge or diverge light. It is measured in diopters (D).

2. **Relation Between Power and Focal Length**:
The power of a lens is inversely related to its focal length (F). The formula is given by:
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