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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

Chapter 1: Chemical Reactions and Equations

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2

Chapter 2: Acid,Bases and Salts

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3

Chapter 3: Metals and Non-metals

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4

Chapter 4: Carbon and its Compound

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5

Chapter 5: Periodic Classification of Elements

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6

Chapter 6: Life Processes

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7

Chapter 7: Control and Coordination

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8

Chapter 8: How do Organism Reproduce?

11 questions

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9

Chapter 9: Heredity and Evolution

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10

Chapter 10: Light -Reflection and Refraction

34 questions

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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

49 questions

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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
Easy
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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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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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Practice more questions from Science (NCERT)

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 ?
View all

Practice questions from Science (NCERT)

Question 1
Hard
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A person needs a lens of power dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?
Topic

Topic:

The Human Eye and Colourful World

Book

Book:

Science (NCERT)

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Question 2
Hard
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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.
Topic

Topic:

The Human Eye and Colourful World

Book

Book:

Science (NCERT)

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Question 3
Medium
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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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The Human Eye and Colourful World

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Book:

Science (NCERT)

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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