Q1. [1] straightforward exam-ready
A person can see nearby objects clearly but has difficulty seeing distant objects. Which type of lens is used to correct this defect?
- A Convex lens
- B Concave lens
- C Bifocal lens
- D Cylindrical lens
Generated by claude-sonnet-4-6 · 2026-06-26 01:07 · grounding rag
Model Answer
Answer: B — Concave lens
This defect is myopia (near-sightedness). It is corrected by using a concave lens of suitable power, which brings the image back onto the retina.
Source: Chapter 10, Section 10.2 – Defects of Vision and Their Correction
Explanation
- The key phrase "sees nearby clearly, difficulty with distant" = myopia.
- Myopia is corrected by a concave (diverging) lens — not convex.
- Convex lens corrects hypermetropia; bifocal corrects presbyopia; cylindrical corrects astigmatism (not in this syllabus).
- For MCQs, always link the symptom → defect name → corrective lens in your recall.