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ICSE Question Bank
2022Q3(iii)(c)Sense Organs
Short answerModerate1 mark
3(iii)

Study the diagram given below and answer the questions that follow:

Figure for this question

Name the type of lens used to correct this defect.

Topic: Correction of hypermetropia

Previous-year question practice database

Answer

Exam answer

A CONVEX (converging) LENS.

Explanation

A convex lens CONVERGES the rays before they enter the eye, so the weak eye has less bending left to do and the image is brought FORWARD onto the retina.

The pair to learn: image BEHIND the retina (hypermetropia, presbyopia) — CONVEX lens image IN FRONT of the retina (myopia) — CONCAVE lens

A way to decide it by shape rather than by memory: a CONVEX lens is thick in the middle and brings rays TOGETHER; a CONCAVE lens is thin in the middle and spreads them APART. If the focus is falling too far back, you need to bring the rays together sooner.

Parts (a), (b) and (c) form one chain — defect, cause, lens — so identifying the first correctly makes the other two follow automatically.

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