Final answer:
The low grid ratio focusing range is larger. A lower grid ratio results in a larger focusing range, meaning that the distance between the focal spot and the detector can vary more without affecting the image quality.
Step-by-step explanation:
The low grid ratio focusing range is larger. The grid ratio is the relationship between the distance of the focal spot to the detector and the distance of the center of rotation to the detector. A lower grid ratio results in a larger focusing range, meaning that the distance between the focal spot and the detector can vary more without affecting the image quality.