a person cannot see distinctly objects kept beyond 2m

get a person cannot see distinctly objects kept beyond 2m from screen.

A person cannot see distinctly objects kept beyond 2 m . This defect can be corrected by using a lens of power:

Click here👆to get an answer to your question ✍️ A person cannot see distinctly objects kept beyond 2 m . This defect can be corrected by using a lens of power:

Question

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:

A

+0.5 D

B

−0.5 D

C

+0.2 D

D

−0.2 D

Medium Open in App

स्रोत : www.toppr.com

A person cannot see distinctly objects kept beyond class 11 biology CBSE

A person cannot see distinctly objects kept beyond 2m This defect can be corrected by using a lens of which power

A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of which power?

Answer Verified 139.5k+ views 1 likes

Hint: The near point is the minimum distance up to which a person can see while the far point is the maximum distance up to which a person can see properly. When any defects arise in these points then it may lead to unclear vision.Complete answer:

When the person cannot see distinctly objects kept beyond 2m, then he is suffering from myopia. In this condition, the person cannot see the objects that are placed far away but can clearly see the objects that are nearly placed, and the condition is termed as nearsightedness. This defect can be corrected by using the concave lens of the power -0.5 D.

The nearsightedness condition arises when the lens of the eye is unable to converge the rays because the rays come from a very short distance and thus it becomes difficult to diverge those rays more than the far rays.

Additional information

The condition opposite to myopia is hypermetropia where the person is suffering from farsightedness.

In this condition, the lens of the eye is unable to diverge because the rays come from a very long distance, and the retina of the eye is unable to focus on them. This results in the eye using more powers to bend the rays and causes an eye defect.

To correct this defect the person must use convex lenses.

The power of the lens is measured in the SI unit Dioptre.

Note:

To understand the concept of the eye defect better the students must see the image formation through the position of the object and the lens with the help of the diagrams. These eye defects mostly occur in the person above the age of 40 but sometimes it may occur in the children as well.

Crack NEET 2024 with top teachers

Try Vedantu PRO for free

Live Interactive Classes

In-class doubt-solving

Practice tests and quizzes

Latest Vedantu courses for you

Grade 11 Science | CBSE | SCHOOL | English

CBSE PCM (2022-23)

Academic year 2022-23

ENGLISH

Unlimited access till final school exam

School Full course for CBSE students

500+ chapter specific short courses

Physics Chemistry Maths ₹9,000 per year Select and buy

Recently Updated Pages

Most eubacterial antibiotics are obtained from A Rhizobium class 12 biology NEET_UG

Salamin bioinsecticides have been extracted from A class 12 biology NEET_UG

Which of the following statements regarding Baculoviruses class 12 biology NEET_UG

Sewage or municipal sewer pipes should not be directly class 12 biology NEET_UG

Sewage purification is performed by A Microbes B Fertilisers class 12 biology NEET_UG

Enzyme immobilisation is Aconversion of an active enzyme class 12 biology NEET_UG

Trending doubts

Difference Between Plant Cell and Animal Cell

Write an application to the principal requesting five class 10 english CBSE

Ray optics is valid when characteristic dimensions class 12 physics CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Write a letter to the principal requesting him to grant class 10 english CBSE

List out three methods of soil conservation

Epipetalous and syngenesious stamens occur in aSolanaceae class 11 biology CBSE

Change the following sentences into negative and interrogative class 10 english CBSE

A Short Paragraph on our Country India

Related Questions Question 1

Where is aqueous humour produced, what is its circulation path, and where does it drain from the eyeball.

Question 2 Match the columns I II

1. Fovea a. Provides opening for entry of light

2. Iris b. Transduces RBG fight

3. Pupil c. Transmits information to CNS

4. Lens d. Controls amount of light entering

5. Optic nerve e. Focus light on retina

A. 1 – b, 2 – d, 3 – a, 4 – e, 5 – c

B. 1 – a, 2 – b, 3 – d, 4 – e, 5 – b

C. 1 – c, 2 – a, 3 – d, 4 – c, 5 – b

D. 1 – e, 2 – a, 3 – d, 4 – c, 5 – c

E. 1 – d, 2 – a, 3 – e, 4 – b, 5 - c

स्रोत : www.vedantu.com

A person cannot see distinctly objects kept beyond 2m.This defect can be corrected by using a lens of what power?

A person cannot see distinctly objects kept beyond 2m.This defect can be corrected by using a lens of what power? - Get the answer to this question and access a vast question bank that is tailored for students.

Academic QuestionsBiology QuestionsA Person Cannot See Distinctly Objects Kept Beyond 2m This Defect Can Be Corrected By Using A Lens Of What Power

A person cannot see distinctly objects kept beyond 2m.This defect can be corrected by using a lens of what power?

Answer:

The eye defect in which a person cannot see objects beyond near points or far objects but can see the near objects clearly is called Myopia. This defect can be corrected by using the biconvex lens.

Solution

The distance of the far point (D) = 2m

Let f be the focal length of the eye lens.

Image distance (distance between eye lens and retina) for our human eye is always constant and is about 2.5 cm. This is due to the action of ciliary muscles.

applying lens formula, we get

f = -D f = -2 cm

but, the power of a lens is reciprocal of focal length.

Power = 1/f. (f in meters)

Power = 1/-2

Power = – 0.5 dioptre.

Check out the video below for more information about spherical lens

Articles to explore

1. Write a note on eye defects and their correction?

2. What are the lens formula, magnification and power of the lens?

Was this answer helpful?

3.5 (24)

Related Questions & Answers

What Are Diathermal Walls Diabatic Walls And Adiabatic Walls

What Does Entropy Mean In Thermodynamics

A Force Is Defined As A

Describe Distance Time Equation

How Many Foci Does A Lens Have

What Are The Methods Of Reducing Friction Explain

Which Of The Following Is An Ohmic Conductor

What Is The Melting And Boiling Point Of Water

Define Fuel Efficiency

What Is The Unit Used To Measure The Atmospheric Pollution

स्रोत : byjus.com