For the normal human eye, the near point is at ___________ cm. - Science and Technology 1

Advertisements
Advertisements
MCQ
Fill in the Blanks

For the normal human eye, the near point is at ___________ cm.

Options

  • 10

  • 20

  • 25

  • 30

Advertisements

Solution

For the normal human eye, the near point is at 25 cm.

  Is there an error in this question or solution?
2019-2020 (March) Set 1

APPEARS IN

RELATED QUESTIONS

Draw labelled diagrams of the following: Eye


Write short notes on the following: Retina 


How does the eye regulate the amount of light that falls on the retina?


How does the eye regulate the amount of light that falls on the retina?


Explain the following:

Mechanism of generation of light-induced impulse in the retina.


Differentiate between: Rods and cones


The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the

(a) fovea

(b) iris

(c) blind spot

(d) optic chaisma


Distinguish between: aqueous humor and vitreous humor


Distinguish between: blind spot and yellow spot


Myopia is an example of ______.


Fill in the blanks in the following.

The size of the pupil becomes ________ when you see in dim light.


Draw a labelled sketch of the human eye.


Describe the anatomy of the human eye.


Explain the mechanism of vision.


Draw a neat and labelled diagram of the structure of the human eye


Match the following:

Column I Column II
(i) Myopia (a) Converging power of eye lens becomes low
(ii) Hypermetropia (b) Converging power of eye lens remains the same
  (c) Converging power of eye lens becomes high

The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D 

 Which is the weaker eye?


A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D 

State whether these lenses are thicker in the middle or at the edges.


A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D 

State whether these spectacle lenses will converge light rays or diverge light rays.


What job does the pupil of the eye do?


Name two types of cells in the retina of an eye which respond to light.


Give the scientific names of the following parts of the eye: 

a hole in the middle of the iris.  


Which part brings the image into sharp focus on the retina? How does it do this?


A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come close to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.


Fill in the following blank with suitable word: 

 Having two eyes gives a ................field of view.


Mention, where in living organism is the following located and state their main function:
Fovea centralis


Mention the characteristics of the image that falls on the retina of the eye.


Name the muscles of the eye responsible for the power of accommodation.


With reference to the functioning of the eye, answer the question that follow:

What is the shape of the lens during distant vision?


Give scientific reason:
One can sense colours only in bright light.


Give scientific reason:

We cannot clearly see an object kept at a distance less than 25 cm from the eye.


What is the function of iris and the muscles connected to the lens in human eye?


Name the following:
Short sightedness.


Label the following diagram :


Draw a labelled diagram of the front view the human eye.

Give the main function of the following:
Fovea centralis    


Sketch and label V.S. of a human eye.


Name the following:
The area where the image is formed but not seen by our eye is termed as.


Name the following:
Yellow spot and ciliary muscles are found in.


What is the nature of the image that forms on the retina?


Give Technical Term:
The cells of the retina that are sensitive to colour.


Mention, if the following statement is True or False
Rods are responsible for vision in the dark


State the Location:
Iris


State the Function:
Vitreous humour


Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:


Long answer question

Draw the neat labelled diagram of the Sectional view of the human eye.


A small hole of changing diameter at the centre of Iris is called _______.


For a normal human eye the near point is at _______.


In a relaxed state, the focal length of healthy eyes is _______.


Write the name.

The part of human eye that transmits electrical signals to the brain.


Write the name.

The ability of lens to adjust the focal length as per need is


Write the name.

The fleshy screen behind cornea.


Write the name.

The screen with light sensitive cells in human eye.


The image of the object in the human eye is formed on the cross screen.


The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.


Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.


Write an Explanation.

Farthest distance of distinct vision


Write an Explanation.

Power of accommodation


Write scientific reason.

The movie cannot be enjoyed if seat of a viewer is too close to the screen in the cinema.


The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.


Write the function of the human eye and label parts of the figure given below.


Complete the paragraph by choosing the right options given below.

(minimum, near point, 25 cm, farthest, farthest distance, far point)

The _______ distance of an object from a normal eye, at which it is clearly visible without stress on the eye, is called the minimum distance of distinct vision. The position of the object at this distance is called the _______ of the eye, for a normal human eye, the near point is at _______. The _______ distance of an object from a human eye, at which it is clearly visible without stress on the eye is called _______ of distinct vision. The position of the object at this distance is called the _______ of the eye.


______ is the structural and functional unit of living organisms.


Why the human eye is compared with camera?


Draw the struture of human eye and label its parts.


Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.

  1. How does excessive usage of mobile phone affect our eyes?
  2. What are the values shown by the teacher?

In a myopic eye, the image of the object is formed


A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?


We cannot distinguish colours in dim light. Explain giving suitable reasons.


A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?

(A) (B)  (C) (D)

Which of the following statements is correct regarding rods and cones in the human eye?


In the figure of the human eye, the cornea is represented by the letter


Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?


Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?


What kind of lens is there in our eyes? Where does it form the image of an object?


Which part of the eye gets affected if someone is suffering from cataract? How is it treated?


Write down the names of parts of the eye in the blank spaces shown in the figure.


______ is a transparent layer.


______ of the eye is comparable to the film of a camera.


The transparent membrane that keeps the eye moist is ______.


What is ‘white of the eye’?


Describe the parts in the external structure of the eye.


Which one of the following statements is NOT correct? 


Select the option with incorrect identification:


Which cells of the retina enable us to see coloured objects around us?


The innermost layer of human eye is ______.


Match the following:

Column - I Column - II
1. Retina a) Path way of light
2. Pupil b) Far point comes closer
3. Ciliary muscles c) near point moves away
4. Myopia d) Screen of the eye
5. Hypermetropia e) Power of accommodation

Match the following:

Column - I Column - II
1. Retina a. Path way of light
2. Pupil b. Far point comes closer
3. Ciliary muscles c. near point moves away
4. Myopia d. Screen of the eye
5. Hypermetropia e. Power of accommodation

Match the following:

Column - I Column - II
1

Retina 

a Pathway of light
2 Pupil b

Far point comes closer

3 Ciliary muscles c

near point moves away

4 Myopia d Screen of the eye
5 Hypermetropia f Power of accommodation

With reference to human eye, answer the following question.

What is aqueous humor?


With reference to human eye, answer the following question.

What is blind spot?


With neat, labeled diagram describe the structure of retina of eye.


Match the following:

Column - I Column - II
1. Retina a. Pathway of light
2. Pupil b. Far point comes closer
3. Ciliary muscles c. near point moves away
4. Myopia d. Screen of the eye
5. Hypermetropia f. Power of accommodation

Match the following:

  Column - I   Column - II
1 Retina a  pathway of light
2 Pupil b

far point comes closer

3 Ciliary muscles c

near point moves away

4 Myopia d screen of the eye
5 Hypermetropia e power of accommodation

Column I Column II
1 Retina a Path way of light
2 Pupil b Far point comes closer
3 Ciliary muscles c near point moves away
4 Myopia d Screen of the eye
5 Hypermetropia e Power of accomodation

Match the following:

Column - I Column - II
1. Retina a. Path way of light
2. Pupil b. Far point comes closer
3. Ciliary muscles c. near point moves away
4. Myopia d. Screen of the eye
5. Hypermetropia e. Power of accommodation

Match the following:

Column - I Column - II
1. Retina a. Path way of light
2. Pupil b. Far point comes closer
3. Ciliary muscles c. near point moves away
4. Myopia d. Screen of the eye
5. Hypermetropia e. Power of accommodation

Share
Notifications



      Forgot password?
Use app×