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What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50cm?

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+70cm

+80cm

+60cm

+50cm

answer is B.

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Detailed Solution

Reading spectacles will have the image distance at 25cm

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$

$\frac{1}{- 50} - \frac{1}{- 25} = \frac{- 1}{50} + \frac{1}{25} = \frac{1}{50}$

$f = + 50 cm$

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