How will the focal length of a lens is changed if its aperture is increased to double ?

Explanation

To determine how the focal length of a lens changes when its aperture is increased to double, we can analyze the situation using the Lensmaker's formula.

### Step-by-Step Solution:

1. **Understanding Aperture**:
- The aperture of a lens refers to the diameter of the lens opening through which light enters. Increasing the aperture allows more light to pass through the lens.

2. **Lensmaker's Formula**:
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