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

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Solution

(a) Concave lens
(b) Convex lens

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

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. (a) What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show :
(i) the eye-defect short-sightedness.
(ii) correction of short-sightedness by using a lens.
(b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision ?

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

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

(a) Concave lens(b) Convex lens

(a) Concave lens
(b) Convex lens