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A person can not see objects beyond 50cm...

A person can not see objects beyond `50cm`.The power of a lens to correct this vision will be

A

`+2D`

B

`-2D`

C

`+5D`

D

`0.5D`

Text Solution

Verified by Experts

The correct Answer is:
2
As the person can see objects beyond upto`50cm`.It means that the image of an object situated at infinity must be formed at`50cm`i.e,
`u=oo,v=-50cm`,therefore from`(1)/(f)=(1)/(v)+(1)/(u)`
or`f=v=-50cm`
`because P=(1)/(f)meter`
or`P=-(1)/(0.50)=-2D`
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