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Question 26
When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?


Solution

When a person is not able to see distant objects clearly but can see nearby objects clearly then his eyes are suffering from myopia or short-sightedness. This defect is caused due to enlargement of eyeball because of which the image by eyelens is formed before retina.
The short-sightedness is corrected by using a concave lens, which diverges and shifts the image to the retina.

Short-sighted eye with correction usng corrective concave lens.

Long-sightedness or Hypermetropia is caused due to shortening of eyeball because of which the image by eyelens is formed beyond retina.
Long-sightedness is corrected by using a convex lens, which converges and shifts the image to the retina.


Long-sighted eye with correction using corrective convex lens.


Physics

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