Applying the SLOB rule: A radiopaque object is seen on the root of tooth #5. When the tube is shifted to DISTAL, the object moves toward tooth #6 (also distal). Where is the radiopaque object located?

Applying SLOB: The tube was shifted DISTAL and the object moved DISTAL (same direction as the tube shift). SLOB: Same = Lingual. Because the object moved in the SAME direction as the tube shift, it is located on the PALATAL (lingual) side. If it had moved in the OPPOSITE direction (mesial), it would be buccal. This is a direct application of the SLOB rule.