An optometrist prescribes contact lenses that have a focal, Physics

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An optometrist prescribes contact lenses that have a focal

An optometrist prescribes contact lenses that have a focal length of 50.0cm. Are the lenses converging or diverging? Is the person who wears them near-sighted or far-sighted? Where is this person's unaided near point located if we assume that the above lenses are designed such that objects no closer than 30cm can be seen clearly?

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