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A person needs a lens of power \(-5.5\ dioptres\) for correcting his distant vision. For correcting his near vision he needs a lens of power \(+1.5\ dioptre\). What is the focal length of the lens required for correcting
(i) distant vision, and
(ii) near vision?
(i) distant vision, and
(ii) near vision?
The power (\(P\)) of a lens of focal length (\(f\)) is given by the relation,
Case (i):
Power of the lens used for by the person correcting distant vision \(=\ −5.5\ D\)
Distant vision of the person \(=\) \(m\)
Case (ii):
Power of the lens used by the person for correcting near vision \(=\ +1.5\ D\)
Near vision of the person \(=\) \(m\)
(Note: Enter your answer with three decimal digits)
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