A person can focus clearly only on objects between 36.5 cm and 47.5 cm from his

Question

A person can focus clearly only on objects between 36.5 cm and 47.5 cm from his eyes. You may want to review For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Correcting for farsightedness. Find the focal lengths of the correcting contact needed to correct his closeup vision and distant vision. Answer in the order indicated. Separate your answers with a comma. f_closeup, f_distant = cm Find the powers of the correcting contact lenses needed to correct his closeup vision and distant vision. Answer in the order indicated. Separate your answers with a comma. D_closeup, D_distant = diopters

Explanation / Answer

For the closeup correction

1/f = 1/25 + 1/-36.5

f = 79.35 cm

For the distance vision

1/f = 1/ + 1/-47.5

f = -47.5 cm

The power...

Closeup = 1/0.7935 = 1.26 diopters

Distance = 1/-0.475 = -2.105 diopters

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