The defect hypermetropia of an eye can be corrected by using spectacles containing ....................... lens.

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Solution

Convex lens
This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it. This occurs when the eyeball is too short or the refractive power of the lens is too weak. Hyperopia can be corrected by wearing glasses/contacts that contain convex lenses.

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Myopic eye defect can be corrected by using convex lens.

Q. The defect of vision which cannot be corrected by using spectacles is :
(a) myopia (b) presbyopia (c) cataract (d) hypermetropia

Man A has a defect of vision due to which he cannot see the nearby objects clearly (through he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant objects clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.
(a) Name the defect of vision in man (i) A and (ii) B.
(b) What type of lenses are (i) C and (ii) D?

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. Hypermetropia can be corrected by using ____________ lens.

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