Chapter 26, Problem 077 Your friend has a near point of 146 cm, and she wears co

Question

Chapter 26, Problem 077 Your friend has a near point of 146 cm, and she wears contact lenses that have a focal length of 31.4 cm. How close can she hold a magazine and still read it clearly? Number Units the tolerance is +/-696 SHOW HINT LINK TO TEXT By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor Question Attempts: Unlimited SAVE FOR LATER SUBMIT ANSWER Earn Maximum Points available only if you answer this question correctly in four attempts or less

Explanation / Answer

from lens law,

1/f = 1/do + 1/di

1/do = 1/f - 1/di

where

di = -146 cm = -1.46 m

f = 31.4 cm = 0.314 m

1/do = 1/0.314 - (1/-1.46)

1/do = 1/0.314 + 1/1.46

do = 25.84 cm

So she has to hold the magazine at a distance of 25.84 cm

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