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Question - Refraction at Spherical Surfaces and by Lenses - Power of a Lens

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ConceptRefraction at Spherical Surfaces and by Lenses - Power of a Lens  

Question

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?

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