Study the diagram given below and answer the questions that follow: (i) Name the defect of vision represented in the diagram. Give reason for your answer. (ii) List two causes of this defect. (iii) With the help of a diagram show how this defect of vision is corrected.
Study the diagram given below and answer the questions that follow: (i) Name the defect of vision represented in the diagram. Give reason for your answer. (ii) List two causes of this defect. (iii) With the help of a diagram show how this defect of vision is corrected.
Official answer
i) Myopia, ii) 1. Excessive curvature of the eye lens, 2. Elongation of the eyeball, iii) A concave lens of suitable power is used to correct myopia.
Marking scheme
- 1.i) Myopia
- 2.ii) 1. Excessive curvature of the eye lens, 2. Elongation of the eyeball
- 3.iii) A concave lens of suitable power is used to correct myopia.
Hint
The diagram shows a concave lens being used to correct myopia. This is because a concave lens spreads out light rays, allowing them to focus on the retina.
Quick oral answer
Myopia is a vision defect where the eyeball is too long or the cornea is too steep, causing light rays to focus in front of the retina instead of on it. This results in close objects being seen clearly, but distant objects appear blurry. A concave lens of suitable power is used to correct myopia by spreading out the light rays before they enter the eye, allowing them to focus on the retina.
Common mistakes
- 1.Confusing myopia with hypermetropia
- 2.Not understanding the role of the concave lens in correcting myopia
Analysis and explanation
Myopia is a common vision defect that occurs when the eyeball is too long or the cornea is too steep, causing light rays to focus in front of the retina instead of on it. This results in close objects being seen clearly, but distant objects appear blurry. The diagram shows how a concave lens can be used to correct myopia by spreading out the light rays before they enter the eye, allowing them to focus on the retina.
Interesting facts
Myopia is a common vision defect that affects millions of people worldwide.
The use of concave lenses to correct myopia has been around for centuries.
Question details
Q31 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2024
- Section
- Section C
- Marks
- 3
- Type
- Short Answer
- Chapter
- The Human Eye and the Colourful World
- Topic
- Defects of Vision
- Bloom's level
- Comprehension
- Syllabus topic
- Defects of Vision
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2024?
This question carries 3 marks in the CBSE Class 10 Science 2024 examination.
Which chapter does this question come from in Science?
This question is from the chapter "The Human Eye and the Colourful World" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Defects of Vision" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2024 paper?
This is a Short Answer question from Section C in the CBSE Class 10 Science 2024 paper.