Final answer:
The thin lens equations method, specifically using the magnification equation m = -di/do, is the most precise for determining lens magnification. Ray tracing is less precise but aids in understanding image formation.
Step-by-step explanation:
The method of finding the magnification of a lens that provides the most accuracy is through the thin lens equations. This method is precise because it is limited only by the accuracy of the information given. The magnification equation, m = -di/do, where di is the image distance and do is the object distance, can provide a numerical value for magnification. In contrast, ray tracing can be limited by drawing precision, but it offers substantial conceptual and visual understanding of the image formation process. To achieve the maximum magnification when using a magnifier, one often positions the image at the near-point distance, which commonly is 25 cm, to allow for comfortable viewing conditions.