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To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?
- a)A concave lens of 0.5 D
- b)A concave lens of 1.0 D
- c)A concave lens of 2.0 D
- d)A convex lens of 2.0 D
Correct answer is option 'C'. Can you explain this answer?
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To read a poster on a wall, a person with defective vision needs to st...
the person is myopic and the defective for point is → 0.4 m
– ve power indicates concave lens.
– ve power indicates concave lens.
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To read a poster on a wall, a person with defective vision needs to st...
Given information:
- A person with defective vision needs to stand at a distance of 0.4m from the poster to read it.
- A person with normal vision can read the poster from a distance of 2.0m.
Explanation:
To correct defective vision, a lens is used to adjust the focal length of the eye's lens system. The focal length of a lens is inversely proportional to its power. The power of a lens is measured in diopters (D). Positive power lenses are convex lenses, while negative power lenses are concave lenses.
In this case, the person with defective vision needs to stand closer to the poster compared to a person with normal vision. This indicates that the person with defective vision has a shorter focal length and requires a lens with greater power to correct the vision.
Analysis:
- The person with normal vision can read the poster from a distance of 2.0m, indicating that their eye's focal length is adjusted properly.
- The person with defective vision needs to stand at a distance of 0.4m to read the same poster, indicating that their eye's focal length is not adjusted properly.
Solution:
To correct the defective vision, a lens with the appropriate power needs to be used. Since the person with defective vision needs to stand closer to the poster, a lens with a shorter focal length is required. This can be achieved by using a concave lens.
Considering the options given:
a) A concave lens of 0.5 D: This lens has a relatively low power and may not provide enough adjustment to correct the defective vision.
b) A concave lens of 1.0 D: This lens has a higher power compared to option a), but it may still not be sufficient to correct the defective vision.
c) A concave lens of 2.0 D: This lens has a higher power compared to options a) and b) and is likely to provide the necessary adjustment to correct the defective vision. Therefore, this is the correct option.
d) A convex lens of 2.0 D: A convex lens would worsen the defective vision instead of correcting it. Therefore, this option is incorrect.
Conclusion:
To correct the defective vision, a concave lens of 2.0 D should be used as it provides the necessary adjustment in focal length to allow the person to read the poster from a normal distance.
- A person with defective vision needs to stand at a distance of 0.4m from the poster to read it.
- A person with normal vision can read the poster from a distance of 2.0m.
Explanation:
To correct defective vision, a lens is used to adjust the focal length of the eye's lens system. The focal length of a lens is inversely proportional to its power. The power of a lens is measured in diopters (D). Positive power lenses are convex lenses, while negative power lenses are concave lenses.
In this case, the person with defective vision needs to stand closer to the poster compared to a person with normal vision. This indicates that the person with defective vision has a shorter focal length and requires a lens with greater power to correct the vision.
Analysis:
- The person with normal vision can read the poster from a distance of 2.0m, indicating that their eye's focal length is adjusted properly.
- The person with defective vision needs to stand at a distance of 0.4m to read the same poster, indicating that their eye's focal length is not adjusted properly.
Solution:
To correct the defective vision, a lens with the appropriate power needs to be used. Since the person with defective vision needs to stand closer to the poster, a lens with a shorter focal length is required. This can be achieved by using a concave lens.
Considering the options given:
a) A concave lens of 0.5 D: This lens has a relatively low power and may not provide enough adjustment to correct the defective vision.
b) A concave lens of 1.0 D: This lens has a higher power compared to option a), but it may still not be sufficient to correct the defective vision.
c) A concave lens of 2.0 D: This lens has a higher power compared to options a) and b) and is likely to provide the necessary adjustment to correct the defective vision. Therefore, this is the correct option.
d) A convex lens of 2.0 D: A convex lens would worsen the defective vision instead of correcting it. Therefore, this option is incorrect.
Conclusion:
To correct the defective vision, a concave lens of 2.0 D should be used as it provides the necessary adjustment in focal length to allow the person to read the poster from a normal distance.
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To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer?
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To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer?.
To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer?.
Solutions for To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10.
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ample number of questions to practice To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lens may be used to correct the defective vision ?a)A concave lens of 0.5 Db)A concave lens of 1.0 Dc)A concave lens of 2.0 Dd)A convex lens of 2.0 DCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 10 tests.
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