what focal length should the reading spectacles have for a person whose near point is $50 c m$ ?

50 c m

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14.6 c m

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22.1 c m

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12.1 c m

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Solution

The correct option is A $50 c m$
$\begin{matrix} u = 50 c m v = 25 c m Lens formula \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \frac{1}{25} - \frac{1}{50} = \frac{1}{f} = \frac{2 - 1}{50} = \frac{1}{f} f = 50 c m \end{matrix}$

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what focal length should the reading spectacles have for a person whose near point is 50 cm?

The correct option is A 50cm u=50 cmv=25 cmLens formula1v−1u=1f125−150=1f=2−150=1ff=50 cm

what focal length should the reading spectacles have for a person whose near point is $50 c m$ ?

The correct option is A $50 c m$
$\begin{matrix} u = 50 c m v = 25 c m Lens formula \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \frac{1}{25} - \frac{1}{50} = \frac{1}{f} = \frac{2 - 1}{50} = \frac{1}{f} f = 50 c m \end{matrix}$