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Q.

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


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a

Convex lens

b

Concave lens

c

Both of them

d

None of these 

answer is A.

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Detailed Solution

A convex lens is used to correct long-sightedness.
       Short-sightedness can be corrected by wearing a spectacle having a suitable concave lens. This concave lens helps the light coming from the object to diverge.
       Long-sightedness is corrected using a convex lens which starts to converge light rays from a nearby object before they enter the eye.
 
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