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#### Question

Calculate the focal length of a corrective lens having power +2.5 D.

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#### Similar questions

How unit of power related to focal length of a lens?

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?

Define 1 dioptre of power of a lens.

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