C25,P21Only need to answer question 21. Question 20 is needed to answer question 21. | 20. • Contact lenses. Contact lenses are placed right on the eye-BIO ball, so the distance from the eye to an object (or image) is thesame as the distance from the lens to that object (or image). Acertain person can see distant objects well, but his near point is45.0 cm from his eyes instead of the usual 25.0 cm. (a) Is thisperson nearsighted or farsighted? (b) What type of lens (con-verging or diverging) is needed to correct his vision? (c) If thecorrecting lenses will be contact lenses, what focal length lensis needed and what is its power in diopters?| 21. ●• Ordinary glasses. Ordinary glasses are worn in front ofBIO the eye and usually 2.0 cm in front of the eyeball. Suppose thatthe person in the previous problem prefers ordinary glasses tocontact lenses. What focal length lenses are needed to correcthis vision, and what is their power in diopters?

near point = 45 cm least distance of distinct vision = 25 cm distance between eye and glasses = 2 cm…

| 21. . Ordinary glasses. Ordinary glasses are worn in front of BIO the eye and usually 2.0 cm in front of the eyeball. Suppose that the person in the previous problem prefers ordinary glasses to contact lenses. What focal length lenses are needed to correct his vision, and what is their power in diopters?

| 21. . Ordinary glasses. Ordinary glasses are worn in front of BIO the eye and usually 2.0 cm in front of the eyeball. Suppose that the person in the previous 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

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter25: Optical Instruments

Section: Chapter Questions

Problem 65AP: A cataract-impaired lens in an eye may be surgically removed and replaced by a manufactured lens....

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

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C25,P21 Only need to answer question 21. Question 20 is needed to answer question 21.

| 20. • Contact lenses. Contact lenses are placed right on the eye-
BIO ball, so the distance from the eye to an object (or image) is the
same as the distance from the lens to that object (or image). 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 (con-
verging or diverging) is needed to correct his vision? (c) If the
correcting lenses will be contact lenses, what focal length lens
is needed and what is its power in diopters?
| 21. ●• Ordinary glasses. Ordinary glasses are worn in front of
BIO the eye and usually 2.0 cm in front of the eyeball. Suppose that
the person in the previous 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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