Find the power of a convex lens of focal length 40 cm.

Explanation

To find the power of a convex lens with a focal length of 40 cm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula for Power of a Lens**:
The power (P) of a lens is given by the formula:
\[
P = \frac{1}{F}
...