The far point of a myopic person is \( 40 \mathrm{~cm} \). To see the distant object clearly, th...

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The far point of a myopic person is \( 40 \mathrm{~cm} \). To see the distant object clearly, the focal length and the power of the lens used should be:
[Punjab 2012]
a. \( -40 \mathrm{~cm},-2.5 \mathrm{D} \)
b. \( -25 \mathrm{~cm},-4.0 \mathrm{D} \)
c. \( +40 \mathrm{~cm},+2.5 \mathrm{D} \)
d. \( -40 \mathrm{~cm},+2.5 \mathrm{D} \)
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