Q1. [2] medium initial-understanding
A ray of light passes through the optical centre of a lens. What happens to its direction after passing through the lens?
Generated by claude-sonnet-4-6 · 2026-06-26 01:11 · grounding rag
Model Answer
A ray of light passing through the optical centre of a lens passes without any deviation — its direction remains unchanged after passing through the lens. This is true for both convex and concave lenses.
Source: Chapter 9, Section 9.3.3 & 9.3.5
Explanation
- The key phrase examiners look for is "without any deviation" (or "without suffering any deviation") — use this exact textbook language.
- State that this applies to both convex and concave lenses to show complete understanding.
- Do not confuse this with other standard rays (parallel ray → passes through focus; ray through focus → emerges parallel).