2. Immediately after conducting an eye checkup. Imran found that he is suffering from long-sightedness. What could be the cause of this defect? a. Increase of focal length of eye lens b. Shortening of eye ball c. Both a and b d. None of the above
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The cause of long-sightedness is option c) Both (a) and (b) Increase of focal length of the eye lens and Shortening of the eye ball
Explanation:
- Long-sightedness or Hypermetropia is a condition in which a person is unable to view the nearer objects clearly.
- It is caused when the eyeball becomes short as well as the increase in focal length of the eye lens.
- Hypermetropia is corrected by the use of a converging lens or a convex lens.
- Since the distance between the retina and eye lens is too short, the focal point gets increases and lies far behind the retina.
- Therefore, usage of a convex lens decreases the focal length of the eye lens and aids to view the nearby objects lucidly.
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