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A man suffering from short-sight is unab...

A man suffering from short-sight is unable to see objects distinctly at a distance more than 2m . The power of lens required to correct this defect should be

A

`-0 . 5D`

B

`-2D`

C

`+0.50D`

D

`+2D`

Text Solution

Verified by Experts

The correct Answer is:
A
Given : Maximum distance of object (u) = 2 m.
We know that if an object is placed at a distance of 2 m (or more), then image is formed at infinity (or) v ` = infty` .
We know that relation for the focal length (f) is
`(1)/(f)=(1)/(v)-(1)/(u)rArr(1)/(f)=(1)/(infty)=-(1)/(2) rArr (1)/(f) = - (1)/(2)`
Therefore power of lens
`(p) = (1)/(f) = -(1)/(2) = - 0 . 5 D`
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