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Defects of Vision and Their Correction

The lens used...

Question

The lens used to correct long sightedness or hypermetropla.

A

Convex lens

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B

Concave lens

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C

Simple lens

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D

Cylindrical lens

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Solution

The correct option is A Convex lens
A person suffering from hypermetropia can see only distant objects clearly but can't see the nearby objects. Hypermetropia can be corrected by using a convex lens.

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Similar questions

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

Rewrite the following table so as to match second and third column with first column

Column		Column II	Column III
(1)	Myopia	Old age problem	Convex lens
(2)	Hypermetropia	Near-sightedness	Bifocal lens
(3)	Presbyopia	Long sightedness	Concave lens

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

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. State whether true or false:

A concave lens is used to correct short-sightedness in eye.

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