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Defects of Vision and Their Correction

What type of ...

Question

What type of lens is used to correct long-sightedness?

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Solution

Long sightedness is a defect of vision in which a person can see distant objects clearly but nearby objects appear blurred. In this defect, the light rays focus behind the retina.

Convex lens is used to correct long sightedness.

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Q. What kind of lens is used to correct (a) short-sightedness (b) long-sightedness ?

Q. The lens used to correct long sightedness or hypermetropla.

Q. (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 sort 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. Complete the following sentence :

(I). A short-sighted person cannot see ............... object clearly. Short-sightedness can be correct by using ........... lenses.

(II). A long-sighted person cannot see .............. object clearly. Long-sightedness can be corrected by using ............ lenses.

Q. What is long-sightedness? The near point of a long-sighted person is at

100 c m

from his eyes. What would be the power of the lens to be used by him in order to read a book placed at

25 c m

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