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Without glasses a man can see objects clearly if they are no closer than 1.8 meters...

Without glasses a man can see objects clearly if they are no closer than 1.8 meters from his eyes. He walks into London Drugs and tries out some glasses there that have a power of +2.3 diopters. If he wears these glasses 1cm from his eyes, what is the shortest distance from his eyes at which he can see objects clearly?

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