what spectacles are required by a person whose near and far point are 40cm and 200 cm away respectively to bring her near point to a distance of 25cm find her new range of vision
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The lens should be such that it shifts the image of object at 25cm from eye to the near point of the defected person.
Hence the lens would follow the following lens equation,
f/1 =P= v/1 − u/1
= −0.4/1 −0.25/1 =1.5D
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