AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The angle between the emergent ray and the direction of the incident ray is called the angle of deviation (∠D).
Source: Chapter 10, Section 10.3
Examiners expect the exact term "angle of deviation." Note that this is different from the angle of refraction or angle of emergence. The peculiar inclined shape of the prism causes the emergent ray to deviate from the original direction of the incident ray, and this angular difference is the angle of deviation.