According to Clark’s rule for localization of object, if tube is shifted mesially to original angulation:

# According to Clark’s rule for localization of object, if tube is shifted mesially to original angulation:

A. Buccal objects move mesially

B. Lingual objects move mesially

C. Both buccal and lingual objects move distally

D. Both buccal and lingual objects move mesially

Correct answer: B. Lingual objects move mesially

According to Clark’s rule (also known as the SLOB rule—Same Lingual, Opposite Buccal) for object localization in dental radiography, when the X-ray tube is shifted mesially while maintaining the original angulation:

Buccal objects (those closer to the cheek) move in the opposite direction of the tube shift, so they move distally.

Lingual objects (those closer to the tongue) move in the same direction as the tube shift, so they move mesially.

Given the options:

A. Buccal objects move mesially: Incorrect, as buccal objects move distally.

B. Lingual objects move mesially: Correct, as lingual objects follow the tube shift direction.

C. Both buccal and lingual objects move distally: Incorrect, as lingual objects move mesially.

D. Both buccal and lingual objects move mesially: Incorrect, as buccal objects move distally.