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A person wears glasses of power -2.5 D. Is the person farsighted or nearsighted? What is the far point of the person without glasses

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longsighted, -40 cm

nearsighted, -40 cm

nearsighted, -20 cm

longsighted, -20 cm

answer is B.

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Detailed Solution

$\begin{array}{l} P = \frac{100}{far point} \Rightarrow - 2 .5 = \frac{100}{far point} \\ \Rightarrow far point = - 40 cm \end{array}$

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