Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 44.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses. Farsighted (a) What focal length lenses are needed to correct his vision? 50.8cm ' = + F do di A 24 f=? dnear Point = 44.0cm de = 44.0cm -2 = 42.0cm do 25.0cm? (b) What is their refractive power in diopters? 1.97 diopters

College Physics
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ISBN:9781305952300
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Chapter1: Units, Trigonometry. And Vectors
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(3)
(3) Vision Correction
Goal: Work with the optics of glasses.
Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A
certain person can see distant objects well, but his near point is 44.0 cm from his eyes instead of
the usual 25.0 cm. Suppose that this person needs ordinary glasses. Farsighted
(a) What focal length lenses are needed to correct his vision? 50.8cm
F
=
do
+
di
f=?
dnear Point = 44.0cm
de 44.0cm-2=42.0cm
do 25.0cm?
24
"
(b) What is their refractive power in diopters? 1.97 diopters
Refractive power = 1
Transcribed Image Text:(3) Vision Correction Goal: Work with the optics of glasses. Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 44.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses. Farsighted (a) What focal length lenses are needed to correct his vision? 50.8cm F = do + di f=? dnear Point = 44.0cm de 44.0cm-2=42.0cm do 25.0cm? 24 " (b) What is their refractive power in diopters? 1.97 diopters Refractive power = 1
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