College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Textbook Question
Chapter 25, Problem 49GP
A person with a near point of 85 cm, but excellent distant vision, normally wears corrective glasses. But he loses them while traveling. Fortunately, he has his old pair as a spare, (a) If the lenses of the old pair have a power of +2.25 diopters, what is his near point (measured from his eye) when he is wearing the old glasses if they rest 2.0 cm in front of his eye? (b) What would his near point be if his old glasses were contact lenses instead?
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Check out a sample textbook solutionStudents have asked these similar questions
For "normal" vision, a healthy near-point is 25 cm and a healthy far-point is o.
Your mom has a far-point of 99 cm.
(a) Is your mom considered near-sighted or far-sighted? near-sighted e
(b) Your mom wears glasses to correct her vision that sit 2.01 cm from her eye. How far from the lenses do her glasses form an image?
cm
(c) What is your mom's prescription number in Diopters? Depending on whether your mom is far-sighted or near-sighted, the placement of the object her glasses help her focus on is different. Glasses
always to work to make the eye "normal", allowing people to see objects at the healthy near- or far-points. Report your answer with the correct sign (±)
P =
(d) Does your mom require a converging lens or a diverging lens?
For "normal" vision, a healthy near-point is 25 cm and a healthy far-point is o,
Your mom has a near-point of 100 cm.
(a) Is your mom considered near-sighted or far-sighted? far-sighted
(b) Your mom wears glasses to correct her vision that sit 1.82 cm from her eye. How far from the lenses do her glasses form an image?
cm
(c) What is your mom's prescription number in Diopters? Depending on whether your mom is far-sighted or near-sighted, the placement of the object her glasses help her
focus on is different. Glasses always to work to make the eye "normal", allowing people to see objects at the healthy near- or far-points. Report your answer with the correct
sign (±)
P =
(d) Does your mom require a converging lens or a diverging lens? converging v
A person with a near point of 75.0 cmcm, but excellent distant vision, normally wears corrective glasses. But he loses them while traveling. Fortunately, he has his old pair as a spare.
QA: If the lenses of the old pair have a power of +2.25 dioptersdiopters , what is his near point (measured from his eye) when he is wearing the old glasses if they rest 2.00 cmcm in front of his eye?
QB: What would his near point be if his old glasses were contact lenses instead?
I got the answers
a) 29.63 cm
b) 27.63 cm
however they came out wrong.
Chapter 25 Solutions
College Physics (10th Edition)
Ch. 25 - Prob. 1CQCh. 25 - A diver proposed using a clear plastic bag full of...Ch. 25 - The human eye is often compared to a camera. In...Ch. 25 - If the sensor array of a digital camera is placed...Ch. 25 - There have been reports of round fishbowls...Ch. 25 - Since a refracting telescope and a compound...Ch. 25 - You are selecting a converging lens for a...Ch. 25 - While choosing between two refracting astronomical...Ch. 25 - When choosing between two refracting astronomical...Ch. 25 - Youve entered a survival contest that will include...
Ch. 25 - If a person is severely nearsighted, can the...Ch. 25 - Ads for amateur telescopes sometimes contain...Ch. 25 - The focusing mechanism of the human eye most...Ch. 25 - Which of the following statements are true about...Ch. 25 - If, without changing anything else, we double the...Ch. 25 - If a person's eyeball is 2.7 cm deep instead of...Ch. 25 - Which of the following statements are true about...Ch. 25 - If a camera lens gives the proper exposure for a...Ch. 25 - Which of the following operations would increase...Ch. 25 - Which of the following statements are true about a...Ch. 25 - A camera is focusing on an animal. As the creature...Ch. 25 - Your eye is focusing on a person As he walks...Ch. 25 - An astronomical telescope is made with an...Ch. 25 - A simple magnifying glass produces a A. real...Ch. 25 - The focal length of an f/4 camera lens is 300 mm....Ch. 25 - A camera has a lens with an aperture diameter of...Ch. 25 - (a) A small refracting telescope designed for...Ch. 25 - A 135 mm telephoto lens for a 35 mm camera has...Ch. 25 - A camera lens has a focal length of 200 mm. How...Ch. 25 - A camera is focused on an object that is 1.2 m...Ch. 25 - A certain digital camera having a lens with focal...Ch. 25 - Your digital camera has a lens with a 50 mm focal...Ch. 25 - You want to take a full-length photo of your...Ch. 25 - Zoom lens. A zoom lens is a lens that varies in...Ch. 25 - The cornea as a thin lens. Measurements on the...Ch. 25 - Range of the focal length of the eye. We can model...Ch. 25 - A 40-year-old optometry patient focuses on a...Ch. 25 - Crystalline lens of the eye. The crystalline lens...Ch. 25 - Contact lenses. Contact lenses are placed right on...Ch. 25 - Ordinary eyeglasses. Ordinary glasses are worn in...Ch. 25 - A person can see clearly up close, but cannot...Ch. 25 - In one form of cataract surgery the person's...Ch. 25 - Bifocals. A person can focus clearly only on...Ch. 25 - A student's far point is at 17.0 cm. and she needs...Ch. 25 - (a) Where is the near point of an eye for which a...Ch. 25 - Corrective lenses. Determine the power of the...Ch. 25 - You want to view an insect 2.00 mm in length...Ch. 25 - A simple magnifier for viewing postage stamps and...Ch. 25 - A thin lens with a focal length of 6.00 cm is used...Ch. 25 - || The focal length of a simple magnifier is 8.00...Ch. 25 - A microscope has an objective lens with a focal...Ch. 25 - A compound microscope has an objective lens of...Ch. 25 - An insect 1.2 mm tall is placed 1.0 mm beyond the...Ch. 25 - The objective lens and the eyepiece of a...Ch. 25 - The focal length of the eyepiece of a certain...Ch. 25 - A certain microscope is provided with objectives...Ch. 25 - Resolution of a microscope. The image formed by a...Ch. 25 - A refracting telescope has an objective lens of...Ch. 25 - The eyepiece of a refracting astronomical...Ch. 25 - Galileos telescopes, I. While Galileo did not...Ch. 25 - The objective mirror of the Hubble Space Telescope...Ch. 25 - The largest refracting telescope in the world is...Ch. 25 - A photographer takes a photograph of a Boeing 747...Ch. 25 - Curvature of the cornea. In a simplified model of...Ch. 25 - A nearsighted eye. A certain very nearsighted...Ch. 25 - You are examining a flea with a converging lens...Ch. 25 - Physician, heal thyself! (a) Experimentally...Ch. 25 - Laser eye surgery. The distance from the vertex of...Ch. 25 - Its all done with mirrors. A photographer standing...Ch. 25 - An amateur photographer purchases a vintage camera...Ch. 25 - A person with a digital camera uses a lens of...Ch. 25 - A microscope with an objective of focal length...Ch. 25 - A person with a near point of 85 cm, but excellent...Ch. 25 - A telescope is constructed from two lenses with...Ch. 25 - Galileos telescopes, II. The characteristics that...Ch. 25 - A frog can see an insect clearly at a distance of...Ch. 25 - Amphibian vision. The eyes of amphibians such as...Ch. 25 - Given that frogs are nearsighted in air, what is...Ch. 25 - To determine whether a frog can judge distance by...
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- For normal distant vision, the eye has a power of 50.0 D. What was the previous far point of a patient who had laser vision correction that reduced the power of her eye by 7.00 D, producing normal distant vision?arrow_forwardThe contact-lens prescription for a nearsighted person is —4.00 D and the person has a far point of 22.5 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?arrow_forwardA nearsighted man cannot see objects clearly beyond 20 cm from his eyes. How close must he stand to a mirror in order to see what he is doing when he shaves?arrow_forward
- Two stars that are 109km apart are viewed by a telescope and found to be separated by an angle of 105 radians. If the eyepiece of the telescope has a focal length of 1.5 cm and the objective has a focal length of 3 meters, how far away are the stars from the observer?arrow_forwardThe accommodation limits for a nearsighted persons eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he can see faraway objects clearly. At what minimum distance is he able to see objects clearly?arrow_forwardIf the lens of a person’s eye is removed because of cataracts (as has been done since ancient times), why would you expect an eyeglass lens of about 16 D to be prescribed?arrow_forward
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- A lamp of height S cm is placed 40 cm in front of a converging lens of focal length 20 cm. There is a plane mirror 15 cm behind the lens. Where would you find the image when you look in the mirror?arrow_forwardTwo thin lenses of focal lengths f1 = 15.0 and f2 = 10.0 cm, respectively, are separated by 35.0 cm along a common axis. The f1 lens is located to the left of the f2 lens. An object is now placed 50.0 cm to the left of the f1 lens, and a final image due to light passing though both lenses forms. By what factor is the final image different in size from the object? (a) 0.600 (b) 1.20 (c) 2.40 (d) 3.60 (e) none of those answersarrow_forwardWhy is your vision so blurry when you open your eyes while swimming under water? How does a face mask enable clear vision?arrow_forward
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