A person has near point at 60 cm . T...

A person has near point at 60 cm . The focal length of spectacles lenses to read at 22 cm having glasses separated 2 cm from the eyes is

`40 cm `

`10 cm`

`20 cm`

`30 cm`

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A person has near point at 60 cm . The focal length of spectacles lenses to read at 22 cm having glasses separated 2 cm from eyes is

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