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ii) Observe the following diagram and answer the sub-questions:
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(a) Which eye defect is shown in this diagram?
(b) What are the possible reasons for this eye defect?
(c) How is this defect corrected? Write it in brief.
Answers
Answer:a) Which eye defect is shown in this diagram?
Ans :- Myopia or nearsightedness.
b) Which are the possible reasons for this eye defect?
Ans:- 1) The curvature of the cornea and the eye lens increases.
2) The muscles near the lens cannot relax so that the converging power of the lens remains large.
3) The distance between the eye lens and the retina increases as the eyeball elongates.
c) How is the defect corrected? Write in brief.
Ans:- 1) Myopia is corrected using a suitable concave lens.
2) Light rays are diverged by the concave lens before they strike the eye lens.
3) A concave lens of proper focal length is chosen to produce the required divergence.
4) Hence, after the converging action of the eye lens, the image is formed on the retina.
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