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प्रश्न
Name the following:
Capacity of the eye to focus at different distances.
उत्तर
Power of accommodation
संबंधित प्रश्न
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 our eyes which helps us to focus near and distant objects in quick succession.
Fill in the following blank with suitable words:
When light is dim, the pupil becomes................
Describe and explain, how a normal eye can see objects lying at various distances clearly.
There are two types of light-sensitive cells in the human eye:
To what is each type of cell sensitive?
Explain the functions of the following parts of the eye:
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens
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
A person got his eyes tested. The optician's prescription for the spectacles reads:
Left eye: − 3.00 D
Right eye: − 3.50 D
The person is having a defect of vision called:
(a) presbyopia
(b) myopia
(c) astigmatism
(d) hypermetropia
Name two animals having eyes:
at the front of the head.
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
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.
Give the main function of the following:
Retina
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
Explain the Term: Accommodation in the eye
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.
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.
Why the human eye is compared with camera?
The layer in the eye where sensory cells (rods and cones) are located ______.
Which of the following is responsible for the adjustment of the size of pupil?
