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Byju's Answer
Standard IX
Physics
Spherical Mirrors
Lens used to ...
Question
Lens used to remove long-sightedness (hypermetropia) is
A
Concave lens
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B
Plano-concave lens
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C
Convexo-concave lens
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D
Convex lens
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Solution
The correct option is
D
Convex lens
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Similar questions
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Long-sightedness is to hypermetropia as short-sightedness is to :
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What kind of lens is used to correct (a) short-sightedness (b) long-sightedness ?
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What type of lens is used to correct long-sightedness?
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The lens used to correct long sightedness or hypermetropla.
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(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?