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प्रश्न
Name the capacity of the eye lens to change its focal length as per need.
Write the name.
The ability of lens to adjust the focal length as per need is:
उत्तर
The capacity of the eye lens to change its focal length as per need is called accommodation.
संबंधित प्रश्न
Write the function of the following part of the human eye:- iris
Define the term.
Power of accommodation of the eye.
Distinguish between: aqueous humor and vitreous humor
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 |
Name the part of the eye:
which controls the amount of light entering the eye.
Name that part of the eye which is equivalent to the photographic film in a camera.
What changes the shape of lens in the eye?
What is the:
near point of a normal human eye?
Fill in the following blank with suitable word:
Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.
There are two types of light-sensitive cells in the human eye:
Where are they found?
Explain why, we cannot see our seats first when we enter a darkened cinema hall from bright light but gradually they become visible.
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Fill in the following blank with suitable word:
Having two eyes gives a ................field of view.
Fill in the following blank with suitable word:
Having two eyes enables us to judge.................more accurately.
What are the advantages of having two eyes instead of just one?
Name two animals having eyes:
at the front of the head.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during near vision?
Define the following:
Power of accommodation
Differentiate between:
Yellow spot and Blind spot.
Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.
Name the following:
Fluid present in the posterior chamber of the eye.
Give Technical Term:
The adjustment of the eye in order to obtain a clear vision of objects at different distances
Mention, if the following statement is True or False
Cones are the receptor cells in the retina of the eye sensitive to dim light.
State the Function:
Iris
Choose the Odd One Out:
Long answer question
Draw the neat labelled diagram of the Sectional view of the human eye.
Write an Explanation.
Farthest distance of distinct vision
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.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
The black opening between the aqueous humour and the lens is called ____________.
When light rays enter the eye, most of the refraction occurs at the ____________.
Which one of the following statements is NOT correct?
In human eye the part which allows light to enter into the eye is ______.
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 blind spot?
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 |
Write in proper sequence the names of all the parts of the human eye through which the light rays coming from an object pass before they form an image on the retina.
Give reason:
Blind spot is considered as 'area of no vision'.
