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A concave lens is used for correction of which of the following eye defects?
Myopia
Hypermetropia
Presbyopia
Select the correct answer using the code given below.
- a)1 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A concave lens is used for correction of which of the following eye d...
- Myopia or shortsightedness is an eye defect in which the person is unable to see far objects clearly. It occurs either due to the shifting of the retina or due to a decrease in the focal length of the lens. It can be corrected by using a concave lens.
- Hypermetropia or long-sightedness is an eye defect where affected person is not able to see close objects clearly. It occurs either due to shifting of the retina in a forward direction or when the focal length of lens increases. It is corrected by using a convex lens.
- Pressbyopia: It is age-related eye defects where a person is not able to see both far-off and close objects clearly, it occurs due to the weakening of ciliary muscles and hardening of the eye lens. It is corrected by using a bifocal lens which is a combination of both concave and convex lens.
Most Upvoted Answer
A concave lens is used for correction of which of the following eye d...
The correct answer is option 'C' - a concave lens is used for the correction of myopia and presbyopia. Let's understand why.
Myopia, also known as nearsightedness, is a common refractive error where distant objects appear blurry, while close objects can be seen clearly. This occurs when the eyeball is too long or the cornea is too curved, causing light rays to focus in front of the retina instead of directly on it. To correct myopia, a concave lens is used.
Presbyopia is an age-related condition that affects the eye's ability to focus on near objects. It occurs when the lens of the eye loses its flexibility, making it difficult to see close-up objects clearly. To correct presbyopia, a concave lens is also used.
Now, let's understand the function of a concave lens and how it corrects these eye defects.
A concave lens is thinner at the center and thicker at the edges. It diverges light rays, meaning it spreads them out. When a person with myopia or presbyopia wears a concave lens, it helps to counteract the excessive focusing power of the eye.
For myopia, the concave lens spreads out the incoming light rays before they enter the eye. This causes the rays to diverge even more, allowing them to focus correctly on the retina instead of in front of it. As a result, distant objects become clearer for the individual.
For presbyopia, the concave lens helps to increase the focusing power of the eye for close-up objects. By spreading out the incoming light rays, the lens allows them to converge more effectively on the retina. This improves the near vision of the individual, making it easier to see objects up close.
In summary, a concave lens is used for the correction of myopia and presbyopia by diverging light rays and adjusting the focusing power of the eye.
Myopia, also known as nearsightedness, is a common refractive error where distant objects appear blurry, while close objects can be seen clearly. This occurs when the eyeball is too long or the cornea is too curved, causing light rays to focus in front of the retina instead of directly on it. To correct myopia, a concave lens is used.
Presbyopia is an age-related condition that affects the eye's ability to focus on near objects. It occurs when the lens of the eye loses its flexibility, making it difficult to see close-up objects clearly. To correct presbyopia, a concave lens is also used.
Now, let's understand the function of a concave lens and how it corrects these eye defects.
A concave lens is thinner at the center and thicker at the edges. It diverges light rays, meaning it spreads them out. When a person with myopia or presbyopia wears a concave lens, it helps to counteract the excessive focusing power of the eye.
For myopia, the concave lens spreads out the incoming light rays before they enter the eye. This causes the rays to diverge even more, allowing them to focus correctly on the retina instead of in front of it. As a result, distant objects become clearer for the individual.
For presbyopia, the concave lens helps to increase the focusing power of the eye for close-up objects. By spreading out the incoming light rays, the lens allows them to converge more effectively on the retina. This improves the near vision of the individual, making it easier to see objects up close.
In summary, a concave lens is used for the correction of myopia and presbyopia by diverging light rays and adjusting the focusing power of the eye.
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A concave lens is used for correction of which of the following eye defects? Myopia Hypermetropia Presbyopia Select the correct answer using the code given below.a) 1 onlyb) 2 and 3 onlyc) 1 and 3 onlyd) 1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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A concave lens is used for correction of which of the following eye defects? Myopia Hypermetropia Presbyopia Select the correct answer using the code given below.a) 1 onlyb) 2 and 3 onlyc) 1 and 3 onlyd) 1, 2 and 3Correct answer is option 'C'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about A concave lens is used for correction of which of the following eye defects? Myopia Hypermetropia Presbyopia Select the correct answer using the code given below.a) 1 onlyb) 2 and 3 onlyc) 1 and 3 onlyd) 1, 2 and 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A concave lens is used for correction of which of the following eye defects? Myopia Hypermetropia Presbyopia Select the correct answer using the code given below.a) 1 onlyb) 2 and 3 onlyc) 1 and 3 onlyd) 1, 2 and 3Correct answer is option 'C'. Can you explain this answer?.
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