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प्रश्न
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
विकल्प
presbyopia
accommodation
near-sightedness
far-sightedness
उत्तर
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to accommodation.
Explanation:
Accommodation enables the human eye to focus objects situated at different distances by adjusting the focal length of the eye lens.
APPEARS IN
संबंधित प्रश्न
Compare the following: Choroid and retina
Explain the following:
Mechanism of generation of light-induced impulse in the retina.
Where does the greatest degree of refraction of light occur in the eye?
What is the:
far point of a normal human eye?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
State the main functions of the following:
Coronary Artery
Define the following:
Blind spot
The diagram alongside represents a certain defect of vision of the human eye.
(i) Name the defect.
(ii) Describe briefly the condition in the eye responsible for the defect.
(iii) Redraw the figure by adding a suitable lens correcting the defect. Label the parts through which light-rays pass.
(iv) What special advantage do human beings derive in having both eyes facing forward?
Differentiate between:
Yellow spot and Blind spot.
Name the following:
The area where the image is formed but not seen by our eye is termed as.
State the Function:
Aqueous humour
State the Function:
Vitreous humour
Complete the following sentence with appropriate Word
The part of the human eye where rod cells and cone cells are located is the:
Name the capacity of the eye lens to change its focal length as per need.
When light rays enter the eye, most of the refraction occurs at the ____________.
Explain the role of the part of human eye responsible for power of accommodation of human 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 | e | power of accommodation |
Name the following:
Place of no vision in the retina of the eye.
