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Why is a normal eye not able to see clearly the objects placed
Science
Science

Class 10

NCERT

Publisher:
NCERT
Subject:
Science
1

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2

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3

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Chapter 4: Carbon and its Compound

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8

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9

Chapter 9: Heredity and Evolution

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10

Chapter 10: Light -Reflection and Refraction

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11

Chapter 11: The Human Eye and Colourful World

18 questions

Q1
Make a diagram to show how hypermetropia is corrected. The near point of hypermetropic eye is 1 m. What is the power of lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
Q2
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Q3
What happens to the image distance in the eye when we increase the distance of an object from the eye ?
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12

Chapter 12: Electricity

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13

Chapter 13: Magnetic Effects of Electric Current

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14

Chapter 14: Sources of Energy

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15

Chapter 15: Our Environment

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16

Chapter 16: Sustainable Management of Natural Resources

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Question
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Solving time: 2 mins

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

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Updated on: Nov 5, 2022

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Science (NCERT)

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Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
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Text SolutionText solutionverified iconVerified

Ciliary muscles contract and expand to change the focal length of eye lens so that it is able to see objects at variable distances. However, too much contraction lays a lot of stress on the eye muscles and when objects are closer than the near point(25 cm), the eye is unable to focus its image on retina. Hence, a normal eye cannot see objects closer than 25 cm clearly. 

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Make a diagram to show how hypermetropia is corrected. The near point of hypermetropic eye is 1 m. What is the power of lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
Q2
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
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What happens to the image distance in the eye when we increase the distance of an object from the eye ?
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Question Text
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Updated OnNov 5, 2022
TopicThe Human Eye and Colourful World
SubjectScience
ClassClass 10
Answer TypeText solution:1 Video solution: 4
Upvotes349
Avg. Video Duration4 min