AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
C — Angle of deviation
The angle between the emergent ray and the direction of the incident ray when light passes through a prism is called the angle of deviation (∠D).
The passage from Chapter 10 explicitly states: "The peculiar shape of the prism makes the emergent ray bend at an angle to the direction of the incident ray. This angle is called the angle of deviation." Angle of prism (A) is between the two lateral faces; angle of refraction is at the surface; critical angle relates to total internal reflection — all distractors here.