To calculate the object distance, you can use the formula: Object distance = focal length / magnification. This formula assumes that the focal length and magnification are in the same unit, typically in meters.
Yes, this formula can be used for any type of lens, whether it is convex, concave, or a combination of both. Just make sure to use the correct sign convention for the focal length and magnification.
In this case, you can rearrange the formula to find the focal length: Focal length = object distance * magnification. Again, make sure to use the correct sign convention for the object distance and magnification.
This method is fairly accurate for simple lenses, but it may not be as precise for more complex lenses with multiple elements. In those cases, it's best to use more advanced techniques for calculating object distance.
In addition to the focal length and magnification, you will also need to know the position of the object and the image. This can be determined by measuring the distance from the lens to the object and the lens to the image. Make sure to use the correct sign convention for these measurements as well.