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प्रश्न
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
उत्तर
The eye lens being convex in nature converges the light rays incident on it. Hence, it focuses the light falling on it on a thin layer of nerve cells called the retina. Two Ciliary muscles hold the lens within the eye-ball and it relaxes and tightens to change the focal length of the eye lens to get a clear image on the retina.
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संबंधित प्रश्न
Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye.
Describe the anatomy of the human eye.
What changes take place in the shape of eye-lens:
when the eye is focused on a near object?
There are two types of light-sensitive cells in the human eye:
To what is each type of cell sensitive?
How much is our field of view:
with one eye open?
In what two ways is the yellow spot different from the blind spot?
Label the following diagram :
State the functions of the following:
Iris
Where is the following located?
Yellow spot
The figure given below refers to the vertical section of the eye of a mammal. Study the figure carefully and answer the following questions.
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- Label the guidelines shown as 1 to 10.
- Write one important role of parts shown as 3 and 7.
- Write one structural difference between the parts shown as 9 and 10.
- Mention one functional difference between the parts shown as 6 and 8.
