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The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.?
Most Upvoted Answer
The near point of an elderly person is 50 cm from the eye. Find the fo...
The disease is hypermetropia and the lens that is use is convex
1/f = 1/-x +1/25
1/f = 1/-50+ 1/25
1/f = -1+2/50
1/f = 1/50
f = 50 cm
P = 1/f
P = 1/50/100
P= 100/50=2
P = 2 D
1/f = 1/-x +1/25
1/f = 1/-50+ 1/25
1/f = -1+2/50
1/f = 1/50
f = 50 cm
P = 1/f
P = 1/50/100
P= 100/50=2
P = 2 D
Community Answer
The near point of an elderly person is 50 cm from the eye. Find the fo...
Calculating the Focal Length and Power of Corrective Lens
Given Information:
- Near point distance (D) = 50 cm
- Distance of the corrective lens from the eye (D') = ?
- Focal length of the corrective lens (f) = ?
- Power of the corrective lens (P) = ?
Finding the Focal Length:
- The formula relating the focal length of a lens to the object distance and image distance is: 1/f = 1/D + 1/D'
- Since we are dealing with a corrective lens, the object distance (D) is the near point distance, which is 50 cm.
- Substitute the values into the formula: 1/f = 1/50 + 1/D'
- Now, solve for the focal length f.
Finding the Power of the Corrective Lens:
- The formula for calculating the power of a lens is: P = 1/f
- Once you have found the focal length f, you can calculate the power of the corrective lens by taking the reciprocal of the focal length.
- Make sure to express the power in diopters (D).
Conclusion:
- After calculating the focal length and power of the corrective lens using the given near point distance of 50 cm, you can determine the appropriate lens that will correct the vision of the elderly person.
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The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.?
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The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.? 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 The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.?.
The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.? 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 The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The near point of an elderly person is 50 cm from the eye. Find the focal length and power of the corrective lens that will correct his vision.?.
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