5. 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 (1) distant vision, and (ii ) near vision?
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Given that the power of the concave lens required to correct the distant vision of the person, P = -5.5 D. Hence, the focal length of the concave lens required to correct the person's distant vision is -18.18 cm.
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