Q1. [1] straightforward thorough-understanding
In the refraction of light through a triangular glass prism, which of the following correctly describes the angle of deviation?
(A) The angle between the incident ray and the refracted ray inside the prism
(B) The angle between the emergent ray and the direction of the original incident ray
(C) The angle between the two refracting surfaces of the prism
(D) The angle at which the emergent ray meets the base of the prism
- A The angle between the incident ray and the refracted ray inside the prism
- B The angle between the emergent ray and the direction of the original incident ray
- C The angle between the two refracting surfaces of the prism
- D The angle at which the emergent ray meets the base of the prism
Generated by claude-sonnet-4-6 · 2026-06-26 01:08 · grounding rag
Model Answer
(B) The angle between the emergent ray and the direction of the original incident ray
Explanation
The textbook (Section 10.3) 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 (∠D)." Option C describes the angle of the prism, not deviation. Always distinguish between angle of deviation (∠D) and angle of the prism (∠A).
Source: Chapter 10, Section 10.3 – Refraction of Light through a Prism