Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Science

The Human Eye and Colourful World

A person needs a lens of power -5.5 dioptres for correcting hi

Science

Class 10

NCERT

Chapter 1: Chemical Reactions and Equations

34 questions

Chapter 2: Acid,Bases and Salts

39 questions

Chapter 3: Metals and Non-metals

38 questions

Chapter 4: Carbon and its Compound

24 questions

Chapter 5: Periodic Classification of Elements

30 questions

Chapter 6: Life Processes

13 questions

Chapter 7: Control and Coordination

12 questions

Chapter 8: How do Organism Reproduce?

11 questions

Chapter 9: Heredity and Evolution

12 questions

Chapter 10: Light -Reflection and Refraction

34 questions

Chapter 11: The Human Eye and Colourful World

18 questions

A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

A person needs a lens of power

- 5.5

dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power

+ 1.5

dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

The far point of a myopic person is

80 c m

in front of the eye. What is the nature and power of lens required to correct the problem?

View all question

Chapter 12: Electricity

49 questions

Chapter 13: Magnetic Effects of Electric Current

39 questions

Chapter 14: Sources of Energy

24 questions

Chapter 15: Our Environment

9 questions

Chapter 16: Sustainable Management of Natural Resources

7 questions

Question

Hard

Solving time: 3 mins

A person needs a lens of power $- 5.5$ dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power $+ 1.5$ dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

Views: 5,803 students

Updated on: Aug 18, 2023

Book:

Science (NCERT)

Found 3 tutors discussing this question

William Discussed

A person needs a lens of power

- 5.5

dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power

+ 1.5

dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

6 mins ago

Discuss this question LIVE

6 mins ago

Text solutionVerified

(i) Distant Vision :

Given,

Power

= 5.5 D

Power,

P = \frac{1}{f}

Focal length,

f = \frac{1}{P}

\Rightarrow f = \frac{1}{- 5.5}

\Rightarrow f = \frac{10}{- 55}

\Rightarrow f = \frac{2}{- 11}

\Rightarrow f = - 0.181 m

\Rightarrow f = - 18.1 c m

(ii) Near Vision :

Given,

Power

= 1.5 D

P = \frac{1}{f}

f = \frac{1}{P}

\Rightarrow f = \frac{1}{1.5}

\Rightarrow f = \frac{10}{15}

\Rightarrow f = \frac{2}{3}

\Rightarrow f = 0.667 m

\Rightarrow f = 66.7 c m

Was this solution helpful?

Report

Filo tutor solutions (20)

Learn from their 1-to-1 discussion with Filo tutors.

9 mins

Uploaded on: 2/8/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Avinash Anand

Total classes on Filo by this tutor - 2,453

Teaches : Science, Mathematics, English

Connect instantly with this tutor

Connect now

Notes from this class (3 pages)

Download

Was this solution helpful?

Report

4 mins

Uploaded on: 2/8/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Joginder Singh Parmar

Total classes on Filo by this tutor - 3,674

Teaches : Science, Mathematics, Social Studies (SST)

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

Report

5 mins

Uploaded on: 1/28/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Ashish

Total classes on Filo by this tutor - 22,188

Teaches : Science, Mathematics, English

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

Report

See more 1-on-1 discussions (17)

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Practice more questions from Science (NCERT)

A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

A person needs a lens of power

- 5.5

dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power

+ 1.5

dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

The far point of a myopic person is

80 c m

in front of the eye. What is the nature and power of lens required to correct the problem?

View all

Stuck on the question or explanation?

Connect with our Science tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	A person needs a lens of power $- 5.5$ dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power $+ 1.5$ dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?
Updated On	Aug 18, 2023
Topic	The Human Eye and Colourful World
Subject	Science
Class	Class 10
Answer Type	Text solution:1 Video solution: 20
Upvotes	1964
Avg. Video Duration	4 min

A person needs a lens of power $- 5.5$ dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power $+ 1.5$ dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

Text solutionVerified

Filo tutor solutions (20)

Practice more questions from Science (NCERT)

Practice questions from Science (NCERT)

Practice more questions from The Human Eye and Colourful World

Practice questions on similar concepts asked by Filo students

A person needs a lens of power −5.5 dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

Text solutionVerified

Filo tutor solutions (20)

Practice more questions from Science (NCERT)

Practice questions from Science (NCERT)

Practice more questions from The Human Eye and Colourful World

Practice questions on similar concepts asked by Filo students

Related books for questions on The Human Eye and Colourful World

A person needs a lens of power $- 5.5$ dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power $+ 1.5$ dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?