the near point of a near-sighted person is 12cm from his eyes without glasses and 17cm with glasses located 2cm from his eyes. a)What is the prescription of his glasses? b) What is this persons far point without glasses?
Added by Alexandra L.
Step 1
Without glasses, the near point is 12cm. With glasses, the near point is 17cm, but the glasses are located 2cm from the eyes. This means that the effective distance of the glasses is 17cm - 2cm = 15cm. The prescription of the glasses is the reciprocal of the Show more…
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