Question 191 markMCQSection A

Assertion (A) : Myopic eye cannot see distant objects distinctly.

Reason (R) : For the correction of myopia converging lenses of appropriate power are prescribed by eye-surgeons.

Defects of Vision and Their Correction

Options

(A)Both (A) and (R) are true and (R) is the correct explanation of (A).
(B)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C)(A) is true, but (R) is false.
(D)(A) is false, but (R) is true.

Official answer

The correct option is C.

Answer keywords:Myopiaconcave lensdiverging lensdistant objects

Marking scheme

  1. 1.1 Mark for identifying that Assertion is true but Reason is false (Option C).

Hint

Think about whether a myopic eye needs a lens that diverges light rays or converges them to bring the image back onto the retina.

Quick oral answer

Myopia is corrected using a concave lens because it is a diverging lens that helps focus the light rays from distant objects precisely on the retina.

Common mistakes

  1. 1.Students often confuse converging (convex) lenses with diverging (concave) lenses when associating them with myopia and hypermetropia.

Analysis and explanation

  • Assertion (A) is true: A person with myopia (near-sightedness) can see nearby objects clearly but cannot see distant objects distinctly.
  • Reason (R) is false: Myopia is corrected by using a concave lens (which is a diverging lens) of suitable power, not a converging (convex) lens. Converging lenses are used to correct hypermetropia.

Since Assertion is true but Reason is false, the correct option is C.

Interesting facts

In a myopic eye, the image of a distant object is formed in front of the retina rather than on it, which is why a diverging lens is needed to push the focus back onto the retina.

Question details

Q19 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2024
Section
Section A
Marks
1
Type
MCQ
Topic
Defects of Vision and Their Correction
Bloom's level
Understanding
Syllabus topic
Myopia and its correction

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

What topic does this question cover in Science?

This question covers the topic "Defects of Vision and Their Correction" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.