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प्रश्न
Given alongside is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow:
- Identify the defect.
- Name the parts labelled 1, 2 and 3.
- Give two possible reasons for this eye defect.
- Draw a labelled diagram to show how the above mentioned defect is rectified.
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उत्तर
- Myopia
- 1: Vitreous humour
2: Fovea
3: Optic nerve - Lengthening of the eyeball from front to back.
Lens is too curved. 
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संबंधित प्रश्न
Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?
Which defect of vision can be rectified:
by using a convex lens?
Name any two defects of vision which can be corrected by using spectacles.
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
- Name the type of defect he is suffering from.
- How can this defect by corrected?
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
How can this defect by corrected?
Differentiate between myopia and hypermetropia.
To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses?
Write whether the following is true or false:
A convex lens is used for correcting myopia.
Draw a neat labeled diagram to show how hypermetropia can be rectified.
Complete the following table by observing the given figures:
| Figure → |  |
 |
| Points ↓ | ||
| (a) Name of the defect | ______ | ______ |
| (b) Position of the image | ______ | ______ |
| (c) Lens used to correct the defect | ______ | ______ |
