A person has a near point of 50, cm. What len | vedclass

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(C) The person wants to see an object placed at $u = -25\, cm$ as if it were at their near point $v = -50\, cm$.Using the lens formula: $\frac{1}{f} =

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Convex lens of focal length $50\, cm$

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(C) The person wants to see an object placed at $u = -25\, cm$ as if it were at their near point $v = -50\, cm$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $\frac{1}{f} = \frac{1}{-50} - \frac{1}{-25}$.$\frac{1}{f} = -\frac{1}{50} + \frac{1}{25} = \frac{-1 + 2}{50} = \frac{1}{50}$.Thus,$f = +50\, cm$.$A$ positive focal length indicates a convex lens of focal length $50\, cm$.

$A$ person has a near point of $50\, cm$. What lens should they use to reduce it to $25\, cm$?

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