57. For a healthy human eye, the distant point is infinite distance. - Science and Technology 1

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MCQ
True or False

For a healthy human eye, the distant point is infinite distance.

Options

  • Right

  • Wrong

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Solution

For a healthy human eye, the distant point is infinite distance- Right

  Is there an error in this question or solution?
Chapter 7: Lenses - Right or Wrong sentence

RELATED QUESTIONS

Write the function of the following part of the human eye:- iris


Compare the following: Choroid and retina


Draw labelled diagrams of the following: Eye


Write short notes on the following: Retina 


Answer briefly:

How do you perceive the colour of an object?


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


Distinguish between: aqueous humor and vitreous humor


Distinguish between: blind spot and yellow spot


Which. of the following has normal vision?

(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc


Myopia is an example of ______.


Fill in the blanks in the following.

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


Fill in the blanks in the following.

Night birds have _________ cones than rods in their eyes.

 


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

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 is the name of: 

 the curved, transparent front surface of the eye?


Fill in the following blank with suitable word: 

The part of eye which alters the size of the pupil is............   


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 State the effect on the pupil of the eye. 


Suggest how your irises help to protect the retinas of your eyes from damage by bright light.


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Differentiate between members of the following pair with reference to what is asked in bracket.

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Mention if the following statement is true (T) or false (F) Give reason.

Ciliary muscles regulate the size of the pupil


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

Name the cells of the retina and its respective pigments which get activated in the light.


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?


Define the following:
Blind spot


Label the following diagram :


Give the main function of the following:
Lachrymal glands


Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.


Name the following:
The opening through which light enters the eyes.


Choose the correct answer.
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Name the part of the retina on which an object is focused for the clearest vision.


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Cones are the receptor cells in the retina of the eye sensitive to dim light.


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


Mention, if the following statement is True or False
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Long answer question

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


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


Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:

  1. Name the type of lens in the human eye.
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  3. State the nature of the image formed of the object on the screen inside the 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 _______.


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


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


Write the name.

The fleshy screen behind cornea.


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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.


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Farthest distance of distinct vision


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Power of accommodation


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.


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.


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______ is tough and thick white sheath that protects the inner parts of the eye.


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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?

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The image formed on the retina of the human eye is ____________.


When light rays enter the eye, most of the refraction occurs at the ____________.


The pigmented circular area seen in front of the eye:


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?


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


______ is a transparent layer.


The coloured portion of the eye is the ______.


The transparent membrane that keeps the eye moist is ______.


Match the following

1. Conjunctiva a. Coloured part of eye
2. Cornea b. Photosensitive layer
3. Iris c. Refraction
4. Retina d. Protection

What is ‘white of the eye’?


Which one of the following statements is NOT correct? 


Select the option with incorrect identification:


The innermost layer of human eye is ______.


Match the following:

Column - I Column - II
1. Retina a) Path way of light
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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

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What is aqueous humor?


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

Explain the role of the part of human eye responsible for power of accommodation of human eye. 


Match the following:

  Column - I   Column - II
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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

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