What is meant by long-sightedness? How can this defect be corrected?

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Solution

Long Sightedness: A long sightedness person can see distant objects clearly but objects closer to the eye appears blurred. This can be corrected by using convex lens of appropriate focal length.

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Similar questions

Q. What is myopia (or short sightedness)? What is the cause of this defect? How can this defect be minimized? Explain drawing a ray diagram.

Q. Complete the following sentences:
(a) A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
(b) A long-sighted person cannot see ........... objects clearly. Long-sightedness can be corrected by using .............. lenses.

(a) What is long-sightedness ? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show :
(i) the eye-defect long-sightedness.
(ii) correction of long-sightedness by using a lens.
(b) An eye has a near point distance of 0.75 m. What short of lens in spectacles would be needed to reduce the near point distance to 0.25 m ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?
(c) An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?

Q. Long-sightedness is caused by the eyeball being too short. It can be corrected by the use of a :

What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can be corrected by using an appropriate lens.

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