Q1. [2] deep thorough-understanding
A person is unable to see distant objects clearly. State TWO possible structural reasons for this defect of vision. What common optical consequence, in terms of image formation, leads to blurred distant vision in both cases?
Generated by claude-sonnet-4-6 · 2026-06-26 01:07 · grounding rag
Model Answer
The defect described is myopia (near-sightedness). Two possible structural reasons are:
- Excessive curvature of the eye lens (lens becomes too curved, increasing its converging power).
- Elongation of the eyeball (eyeball becomes too long).
Common optical consequence: In both cases, the image of a distant object is formed in front of the retina instead of on it, causing blurred distant vision.
Source: Chapter 10, Section 10.2 – Defects of Vision and Their Correction
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Explanation
- The question asks for two structural causes and one optical consequence — examiners expect all three points for full marks.
- The structural reasons must be specific (curvature/elongation), not just "weak eye."
- The optical consequence ("image formed in front of the retina") is the key phrase from the textbook — use it verbatim.
- Do not mix up myopia with hypermetropia; the question is about distant objects being blurred.