A person can not see an object lying bey...

A person can not see an object lying beyond`80cm`whereas a normal person can easily see the object distant`160cm`.The focal lengthand the nature of the lens used to rectify this defect will be-

A

`-160cm`conacave

B

`160cm`convex

C

`60cm`concave

D

`160cm`convex

Verified by Experts

The correct Answer is:

1

`because (1)/(f)=(1)/(v)-(1)/(u)`
`(1)/(f)=-(1)/(80)+(1)/(60)`
`:.f=-160`

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