Questions
A person's near point is 50 cm and his far point is 3 m. Power of the lenses he requires for
(i) reading and
(ii) for seeing distant stars are
a
-2 D and 0.33 D
b
2 D and -0.33 D
c
-2 D and 3 D
d
2 D and - 3 D
detailed solution
Correct option is B
For correcting the near point, required focal lengthf=50×2550−25=50 cmSo power P=10050=+2DFor correcting the far point, required focal lengthf = - (defected for point) = - 3 m∴P=−13D=−0.33 DTalk to our academic expert!
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