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Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is?
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Nearsighted person wears a glass of power 5.5 D for distinct vision is...
The correction of nearsightedness requires an understanding of lens power and focal length. Here’s a detailed breakdown:
Understanding Nearsightedness
Nearsightedness, or myopia, means distant objects appear blurry. A power of -5.5 D indicates the corrective lens needed to focus light properly on the retina.
Power and Focal Length Relationship
The power (P) of a lens is related to its focal length (f) by the formula:
P = 1/f (in meters)
For a lens with a power of -5.5 D:
-5.5 D = 1/f
Thus, f = -1/5.5 ≈ -0.1818 m or -18.18 cm.
The negative sign indicates that the focal length is virtual, which is typical for diverging lenses used in nearsighted corrections.
Near Vision Correction
In bifocal lenses, the near vision part compensates for the inability to focus on close objects. The power for near vision is determined by the total required power and the distance of the near object (usually around 25 cm).
Calculating Near Vision Power
To calculate the required power for the near vision segment (P_n):
1. **Distance for Near Vision**: 25 cm = 0.25 m
2. **Required Focal Length for Near Vision**:
f_n = 0.25 m (near object distance)
Using the power formula:
P_n = 1/f_n = 1/0.25 = 4 D
Conclusion
The near vision segment of the bifocals will typically require a **+4 D** power to facilitate clear vision at a standard reading distance, ensuring that the person can see clearly both near and far.
Understanding Nearsightedness
Nearsightedness, or myopia, means distant objects appear blurry. A power of -5.5 D indicates the corrective lens needed to focus light properly on the retina.
Power and Focal Length Relationship
The power (P) of a lens is related to its focal length (f) by the formula:
P = 1/f (in meters)
For a lens with a power of -5.5 D:
-5.5 D = 1/f
Thus, f = -1/5.5 ≈ -0.1818 m or -18.18 cm.
The negative sign indicates that the focal length is virtual, which is typical for diverging lenses used in nearsighted corrections.
Near Vision Correction
In bifocal lenses, the near vision part compensates for the inability to focus on close objects. The power for near vision is determined by the total required power and the distance of the near object (usually around 25 cm).
Calculating Near Vision Power
To calculate the required power for the near vision segment (P_n):
1. **Distance for Near Vision**: 25 cm = 0.25 m
2. **Required Focal Length for Near Vision**:
f_n = 0.25 m (near object distance)
Using the power formula:
P_n = 1/f_n = 1/0.25 = 4 D
Conclusion
The near vision segment of the bifocals will typically require a **+4 D** power to facilitate clear vision at a standard reading distance, ensuring that the person can see clearly both near and far.
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Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is?
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Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is?.
Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Nearsighted person wears a glass of power 5.5 D for distinct vision is doctor prescribes the correction of one deep in near vision part of his bifocals which is related to the main part of the lens in the focal length of his near vision part of the lens is?.
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