A person needs a lens of power -5.5 diopter for correcting his distant vision for correcting his near vision he needs a lens of power +1.5 diopter. what is the focal length of the lens required for correcting
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focal length =1/power
power for distant vision:-5.5
focal length distant vision =1/-5.5
=(-1/5.5)metre
power for near vision =1.5
focal length for near vision=1/1.5
=(1/1.5)metre
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