A person with a near-point distance of 29 cm is able to get, Ask an Expert

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A person with a near-point distance of 29 cm is able to get a usable magnification of 12 with a particular magnifying glass. Her friend is only able to get a usable magnification of 7. What is the friend's near-point distance? Show your work

use the 1st friend's magnification and near point distance to solve for f then plug that value in for the 2nd friend to solve for near point distance.

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