A man can read the number of a distant bus clearly but he finds difficulty in reading a book.
(a) From which defect of the eye is he suffering?
(b) What type of spectacle lens should he use to correct the defect?

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Solution

(a) The man is suffering from hypermetropia (long-sightedness).
(b) To correct his defect of vision, he should use convex lenses in his spectacles.

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Long sight or myopia is a defect in the eye that is more common in old age. People suffering from this defect can read a book clearly, but find it difficult to see a distant road sign. The image of the object, instead of forming in front of the retina, forms behind it. This defect can be corrected by using a convex or a diverging lens.

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A man can read the number of a distant bus clearly but he finds difficulty in reading a book. (a) From which defect of the eye is he suffering? (b) What type of spectacle lens should he use to correct the defect?

(a) The man is suffering from hypermetropia (long-sightedness). (b) To correct his defect of vision, he should use convex lenses in his spectacles.

A man can read the number of a distant bus clearly but he finds difficulty in reading a book.
(a) From which defect of the eye is he suffering?
(b) What type of spectacle lens should he use to correct the defect?

(a) The man is suffering from hypermetropia (long-sightedness).
(b) To correct his defect of vision, he should use convex lenses in his spectacles.