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The near point of a hypermetropic person...

The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye ?

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a) `u=-25cm, upsilon=-75cm`
`1//f=1//25-1//75`, i.e., `f=37.5cm.`
The corrective lens needs to have a converging power of `+2.67` dioptres.
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