Power of lens?

The power of a lens is a measure of its ability to bend light rays. It is typically measured in diopters (D) and is calculated as the reciprocal of the focal length of the lens in meters. A lens with a higher power (measured in positive diopters) will bend light rays more strongly, while a lens with a lower power (measured in negative diopters) will bend light rays less strongly. The power of a lens is an important factor in determining its ability to correct vision problems such as nearsightedness, farsightedness, and astigmatism.

The power of a lens is a measure of its ability to converge or diverge light. It is defined as the reciprocal of the focal length of the lens, and is measured in diopters (D).

The power of a lens is given by the following equation:

```
P = 1/f
```

where:

- P is the power of the lens in diopters
- f is the focal length of the lens in meters

A positive power indicates that the lens is a converging lens, while a negative power indicates that the lens is a diverging lens.

The power of a lens can be used to calculate the image distance and object distance using the thin lens equation:

```
1/f = 1/do + 1/di
```

where:

- do is the object distance in meters
- di is the image distance in meters

The power of a lens can also be used to calculate the magnification of the lens:

```
M = -di/do
```

where:

- M is the magnification