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प्रश्न
Define the following:
Power of accommodation
उत्तर
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संबंधित प्रश्न
Explain why the image distance in the eye does not change when we change the distance of an object from the 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.
What is the:
far point of a normal human eye?
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?
To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
The animals of prey have:
(a) two eyes at the front
(b) two eyes at the back
(c) two eyes on the sides
(d) one eye at the front and one on the side
The animals called predators have:
(a) both the eyes on the sides
(b) one eye on the side and one at the front
(c) one eye on the front and one at the back
(d) both the eyes at the front
Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?
What is the function of iris and the muscles connected to the lens in human eye?
Label the following diagram :
Give Technical Term:
The cells of the retina that are sensitive to colour.
For the normal human eye, the near point is at ___________ cm.
Write the name.
The fleshy screen behind cornea.
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.
______ is a transparent layer.
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 |
Where is the following located?
Yellow spot
Differentiate between members of the following pair with reference to what is asked in the bracket.
Aqueous humour and vitreous humour (location).
