A person needs a lens of power -5.5 dioptrrs for correcting his distant vison. For correcting his near vision,he needs a lens of power +1.5 dioptres. What is the focal length of the lens required for correcting distant vision?
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p=-5.5d, f= ?
p=1/f
5.5=1/f
f=1/-5.5
f=-0.18m
the negative sign indicates that the lens is concave.
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