What is the focal length corrective lens

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A person has a near point of 0.15m and a far point of 0.8m a.) what is the focal length (include the sign) of a corrective lens that will allow that person to form an image of an object 100 meters in front of his eye on the retina? b.) what is the closest object they can "see", i.e. form an image on their retina, with that corrective lens?

Reference no: EM13547786

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