A certain person can see distant objects well, but his near point is 45.0 cm from his eyes instead of the usual 25.0 cm. (a) Is this person nearsighted or farsighted? (b) What type of lens (converging or diverging) is needed to correct his vision? (c) If the correcting lenses are contact lenses, what focal length lens is needed and what is its power in diopters? (d) Ordinary glasses are worn in front of the eye and usually 2.0 cm in front of the eyeball. Suppose that the person in this Problem prefers ordinary glasses to contact lenses. What focal length lenses are needed to correct his vision, and what is their power in diopters?
A certain person can see distant objects well, but his near point is 45.0 cm from his eyes instead of the usual 25.0 cm. (a) Is this person nearsighted or farsighted? (b) What type of lens (converging or diverging) is needed to correct his vision? (c) If the correcting lenses are contact lenses, what focal length lens is needed and what is its power in diopters? (d) Ordinary glasses are worn in front of the eye and usually 2.0 cm in front of the eyeball. Suppose that the person in this Problem prefers ordinary glasses to contact lenses. What focal length lenses are needed to correct his vision, and what is their power in diopters?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:A certain person can see distant objects well, but his near point is
45.0 cm from his eyes instead of the usual 25.0 cm.
(a) Is this person nearsighted or farsighted?
(b) What type of lens (converging or diverging) is needed to
correct his vision?
(c) If the correcting lenses are contact lenses, what focal length
lens is needed and what is its power in diopters?
(d) Ordinary glasses are worn in front of the eye and usually 2.0
cm in front of the eyeball. Suppose that the person in this
Problem prefers ordinary glasses to contact lenses. What focal
length lenses are needed to correct his vision, and what is their
power in diopters?
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