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A doctor has prescribed a corrective len...

A doctor has prescribed a corrective lens of power+ 1.5 D.Find the focal length of lens.Is prescribed lens diverging or converging?

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Define focal length of a lens

The focal length of a lens is expressed by which of the following:

A person needs a lens of power -5.5 d for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 D. What is the focal length of lens required for correcting(i) distant and (ii) near vision?

Is focal length of eye lens fixed? If not, why?

Power of a lens is -5d, its focal length is:

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