UPSC Exam > UPSC Questions > A boy uses spectacles of focal length-60cm. N...
Start Learning for Free
A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.?
Most Upvoted Answer
A boy uses spectacles of focal length-60cm. Narne the defect of vision...
Defect of Vision
The boy is suffering from a vision defect known as myopia, commonly referred to as nearsightedness. This condition occurs when light entering the eye is focused in front of the retina, causing distant objects to appear blurry while close objects can be seen clearly.
Correction of Myopia
To correct myopia, a concave lens (also known as a diverging lens) is used. This type of lens helps in diverging the light rays before they enter the eye, allowing them to focus correctly on the retina.
Computing the Power of the Lens
The power of a lens (P) is calculated using the formula:
\[ P = \frac{1}{f} \]
where \( f \) is the focal length in meters. For the boy's spectacles, the focal length is given as -60 cm, which needs to be converted to meters:
\[ f = -60 \, \text{cm} = -0.60 \, \text{m} \]
Now substituting the value into the power formula:
\[ P = \frac{1}{-0.60} = -1.67 \, \text{D} \]
The negative sign indicates that it is a concave lens, which is appropriate for correcting myopia.
Summary
- Defect: Myopia (Nearsightedness)
- Type of Lens: Concave lens
- Focal Length: -60 cm
- Power of the Lens: -1.67 D
This calculation and understanding of the defect help in providing the necessary correction for the boy's vision.
The boy is suffering from a vision defect known as myopia, commonly referred to as nearsightedness. This condition occurs when light entering the eye is focused in front of the retina, causing distant objects to appear blurry while close objects can be seen clearly.
Correction of Myopia
To correct myopia, a concave lens (also known as a diverging lens) is used. This type of lens helps in diverging the light rays before they enter the eye, allowing them to focus correctly on the retina.
Computing the Power of the Lens
The power of a lens (P) is calculated using the formula:
\[ P = \frac{1}{f} \]
where \( f \) is the focal length in meters. For the boy's spectacles, the focal length is given as -60 cm, which needs to be converted to meters:
\[ f = -60 \, \text{cm} = -0.60 \, \text{m} \]
Now substituting the value into the power formula:
\[ P = \frac{1}{-0.60} = -1.67 \, \text{D} \]
The negative sign indicates that it is a concave lens, which is appropriate for correcting myopia.
Summary
- Defect: Myopia (Nearsightedness)
- Type of Lens: Concave lens
- Focal Length: -60 cm
- Power of the Lens: -1.67 D
This calculation and understanding of the defect help in providing the necessary correction for the boy's vision.
|
Explore Courses for UPSC exam
|
|
Similar UPSC Doubts
Top Courses for UPSCView all
A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.?
Question Description
A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.?.
A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.?.
Solutions for A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? in English & in Hindi are available as part of our courses for UPSC.
Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
Here you can find the meaning of A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? defined & explained in the simplest way possible. Besides giving the explanation of
A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.?, a detailed solution for A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? has been provided alongside types of A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? theory, EduRev gives you an
ample number of questions to practice A boy uses spectacles of focal length-60cm. Narne the defect of vision he is suffering from. Which leas is used for correction of this defect? Compute the power.? tests, examples and also practice UPSC tests.
|
|
Explore Courses for UPSC exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup