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A near-sighted person can see clearly out to a maximum distance of 67 cm. If they want to get contact lenses, what strength prescription in

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A near-sighted person can see clearly out to a maximum distance of 67 cm. If they want to get contact lenses, what strength prescription in Diopters should they get so that they can see objects clearly very far away? Answer is given: -1.5 dioptres I need to see how to work it out, thanks

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