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Question
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
Solution
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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For the normal human eye, the near point is at ___________ cm.
For a healthy human eye, the distant point is infinite distance.
When light rays enter the eye, most of the refraction occurs at the ____________.
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 accomadation |
