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प्रश्न
fill in the following blank with suitable word:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........
उत्तर
A person is short-sighted if his eyeball is too long. Spectacles with a concave lens are needed. A person is long-sighted if his eyeball is too short. Spectacles with a convex lens are needed. These focus light rays exactly on to the retina.
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संबंधित प्रश्न
Name two types of cells in the retina of an eye which respond to light.
Fill in the following blank with suitable word:
The part of eye which alters the size of the pupil is............
Name the following:
The part of the eye responsible for its shape.
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
The figure below compares a part of our eye with a part of a photographic camera.
Explain the mode of working and the functions of the parts of the eye mentioned above.
Why the human eye is compared with camera?
| 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 |
Name the following:
Capacity of the eye to focus at different distances.
Which of the following is responsible for the adjustment of the size of pupil?
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 |
