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The distance of distinct vision of a per...

The distance of distinct vision of a person is `40 cm`. Calcuate the power of the lens he should use to read newspaper at a distance of `25 cm`.

Text Solution

Verified by Experts

The correct Answer is:
`+ 50 cm`
Here, `x' = 50 cm, d = 25 cm, f = ?`
From `f = (x'd)/(x' - d)`,
`f = (50 xx 25)/((50 - 25)) = 50 cm`.
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