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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- In Figures CQ36.11a and CQ36.11b, which glasses correct nearsightedness and which correct farsightedness?arrow_forwardTwo converging lenses having focal length of f1 = 10.0 cm and f2 = 20.0 cm are placed d = 50.0 cm apart, as shown in Figure P23.44. The final image is to be located between the lenses, at the position x = 31.0 cm indicated. (a) How far to the left of the first lens should the object be positioned? (b) What is the overall magnification of the system? (c) Is the final image uptight or inserted? Figure P23.44arrow_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
- Two converging lenses having focal length of f1 = 10.0 cm and f2 = 20.0 cm are placed d = 50.0 cm apart, as shown in Figure P23.44. The final image is to be located between the lenses, at the position x = 31.0 cm indicated. (a) How far to the left of the first lens should the object be positioned? (b) What is the overall magnification of the system? (c) Is the final image uptight or inserted? Figure P23.44arrow_forwardTwo 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_forwardFigure P26.72 shows a thin converging lens for which the radii of curvature of its surfaces have magnitudes of 9.00 cm and 11.0 cm. The lens is in front of a concave spherical mirror with the radius of curvature R = 8.00 cm. Assume the focal points F1 and F2 of the lens are 5.00 cm from the center of the lens. (a) Determine the index of refraction of the lens material. The lens and mirror are 20.0 cm apart, and an object is placed 8.00 cm to the left of the lens. Determine (b) the position of the final image and (c) its magnification as seen by the eye in the figure. (d) Is the final image inverted or upright? Explain.arrow_forward
- Two 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_forwardFigure P26.39 diagrams a cross-section of a camera. It has a single lens of focal length 65.0 mm, which is to form an image on the CCD (charge-coupled device) at the back of the camera. Suppose the position of the lens has been adjusted to focus the image of a distant object. How far and in what direction must the lens be moved to form a sharp image of an object that is 2.00 m away? Figure P26.39arrow_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
- 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_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 converging lens made of crown glass has a focal length of 15.0 cm when used in air. If the lens is immersed in water, what is its focal length? (a) negative (b) less than 15.0 cm (c) equal to 15.0 cm (d) greater than 15.0 cm (e) none of those answersarrow_forward
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