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 20P
A student's far point is at 17.0 cm. and she needs glasses to view her computer screen comfortably at a distance of 45.0 cm. What should be the power of the lenses for her glasses?
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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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- The 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_forwardAn object viewed with the naked eye subtends a 2° angle. If you view the object through a 10 x magnifying glass, what angle is subtended by the image formed on your retina?arrow_forwardShow that the magnification of a thin lens is given by M = di/do (Eq. 38.6). Hint: Follow the derivation of the lens makers equation (page 1233) and start with a thick lens.arrow_forward
- If 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_forwardIn Figures CQ36.11a and CQ36.11b, which glasses correct nearsightedness and which correct farsightedness?arrow_forwardA 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_forward
- A point source of light is 50 cm in front of a converging lens of focal length 30 cm. A concave mirror with a focal length of 20 cm is placed 25 cm behind the lens. Where does the final image form, and what are its orientation and magnification?arrow_forwardFor a normal, relaxed eye, a magnifying glass produces an angular magnification of 4.0. What is the largest magnification possible with this magnifying glass?arrow_forwardA 7.5x binocular produces an angular magnification of 7.50, acting like a telescope. (Mirrors are used to make the image upright.) If the binoculars have objective lenses with a 75.0 cm focal length, what is the focal length of the eyepiece lenses?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_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_forwardWhat will be the formula for the angular magnification of a convex lens of focal length f if the eye is very close to the lens and the near point is located a distance D from the eye?arrow_forward
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Convex and Concave Lenses; Author: Manocha Academy;https://www.youtube.com/watch?v=CJ6aB5ULqa0;License: Standard YouTube License, CC-BY