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The far point of a myopic eye is 10cm from the eye. What must be the focal length of a lens for reading at normal distance (25cm)?

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An Intiative by Sri Chaitanya

- 32.7 cm

- 35.4 cm

- 16.7 cm

- 8.35 cm

answer is B.

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Detailed Solution

$\begin{array}{l} \frac{1}{f} = \frac{1}{v} - \frac{1}{u} = - \frac{1}{10} - \frac{1}{- 25} \\ = \frac{1}{25} - \frac{1}{10} = \frac{- 3}{80} \\ f = - 16.74 cm \end{array}$

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