College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Chapter 19, Problem 9CQ
You have lenses with the following focal lengths: f = 25 mm, 50 mm, 100 mm, and 200 mm. Which lens or pair of lenses would you use, and in what arrangement, to get the highest-power magnifier, microscope, and telescope? Explain.
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Chapter 19 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 19 - On a sunny summer day, with the sun overhead, you...Ch. 19 - Suppose you have two pinhole cameras. The first...Ch. 19 - A photographer focuses his camera on his subject....Ch. 19 - The object for a magnifier is usually placed very...Ch. 19 - A nature photographer taking a close-up shot of an...Ch. 19 - The CCD detector in a certain camera has a width...Ch. 19 - All humans have what is known as a blind spot,...Ch. 19 - Suppose you wanted special glasses designed to...Ch. 19 - You have lenses with the following focal lengths:...Ch. 19 - An 8-year-old child and a 75-year-old man both use...
Ch. 19 - A friend lends you the eyepiece of his microscope...Ch. 19 - An astronomer is using a telescope to observe two...Ch. 19 - A student makes a microscope using an objective...Ch. 19 - Is the wearer of the glasses in Figure Q19.14...Ch. 19 - Prob. 15CQCh. 19 - A collector notices a rare beetle on a tree 1.0 m...Ch. 19 - A microscope has a tube length of 20 cm. What...Ch. 19 - The distance between the objective and eyepiece of...Ch. 19 - A nearsighted person has a near point of 20 cm and...Ch. 19 - A nearsighted person has a near point of 20 cm and...Ch. 19 - A 60-year-old man has a near point of 100 cm,...Ch. 19 - A person looking through a 10 D lens sees an image...Ch. 19 - Prob. 23MCQCh. 19 - An amateur astronomer looks at the moon through a...Ch. 19 - Prob. 1PCh. 19 - A student has built a 20-cm-long pinhole camera...Ch. 19 - A pinhole camera is made from an 80-cm-long box...Ch. 19 - A photographer uses his camera, whose lens has a...Ch. 19 - An older camera has a lens with a focal length of...Ch. 19 - In Figure P19.6 the camera lens has a 50 mm focal...Ch. 19 - a. Estimate the diameter of your eyeball. b. Bring...Ch. 19 - A farsighted person has a near point of 50 cm...Ch. 19 - A nearsighted woman has a far point of 300 cm....Ch. 19 - Martin has severe myopia, with a far point of only...Ch. 19 - Mary, like many older people, has lost all ability...Ch. 19 - Prob. 12PCh. 19 - Prob. 13PCh. 19 - Rank the following people from the most...Ch. 19 - The diameter of a penny is 19 mm. How far from...Ch. 19 - A magnifier has a magnification of 4 for someone...Ch. 19 - A magnifier has a magnification of 5. How far from...Ch. 19 - A farsighted man has a near point of 40 cm. What...Ch. 19 - An inexpensive microscope has a tube length of...Ch. 19 - A standard biological microscope is required to...Ch. 19 - A forensic scientist is using a standard...Ch. 19 - A microscope with an 8.0-mm-focal-length objective...Ch. 19 - The distance between the objective and eyepiece...Ch. 19 - For the combination of two identical lenses shown...Ch. 19 - For the combination of two lenses shown in Figure...Ch. 19 - A researcher is trying to shoot a tranquilizer...Ch. 19 - The objective lens of the refracting telescope at...Ch. 19 - You use your 8 binoculars to focus on a...Ch. 19 - Your telescope has a 700-mm-focal-length objective...Ch. 19 - A narrow beam of light with wavelengths from 450...Ch. 19 - Prob. 31PCh. 19 - A ray of red light, for which n = 1.54, and a ray...Ch. 19 - Two lightbulbs are 1.0 m apart. From what distance...Ch. 19 - A 1.0-cm-diameter microscope objective has a focal...Ch. 19 - A microscope with an objective of focal length 1.6...Ch. 19 - Suppose you point a pinhole camera at a 15-m-tall...Ch. 19 - Jason uses a lens with a focal length of 10.0 cm...Ch. 19 - A magnifier is labeled 5. What would its...Ch. 19 - A 20 microscope objective is designed for use in...Ch. 19 - Two converging lenses with focal lengths of 40 cm...Ch. 19 - A converging lens with a focal length of 40 cm and...Ch. 19 - A lens with a focal length of 25 cm is placed 40...Ch. 19 - A microscope with a 5 objective lens images a...Ch. 19 - Prob. 44GPCh. 19 - A 20 objective and 10 eyepiece give an angular...Ch. 19 - The objective lens and the eyepiece lens of a...Ch. 19 - Your telescope has an objective lens with a focal...Ch. 19 - Martha is viewing a distant mountain with a...Ch. 19 - Susan is quite nearsighted; without her glasses,...Ch. 19 - A spy satellite uses a telescope with a...Ch. 19 - Two stars have an angular separation of 3.3 105...Ch. 19 - Frank is nearsighted and his glasses require a...Ch. 19 - What is the angular resolution of the Hubble Space...Ch. 19 - The Hubble Space Telescope has a mirror diameter...Ch. 19 - Once dark adapted, the pupil of your eye is...Ch. 19 - The normal human eye has maximum visual acuity...Ch. 19 - Prob. 57GPCh. 19 - Light that enters your eyes is focused to form an...Ch. 19 - Light that enters your eyes is focused to form an...Ch. 19 - Light that enters your eyes is focused to form an...Ch. 19 - Light that enters your eyes is focused to form an...
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- A group of students is given two converging lenses. Lens A has a focal length of 12.5 cm, and lens B has a focal length of 50.0 cm. The diameter of each lens is 6.50 cm. The students are asked to construct a microscope from these lenses that has the same magnification as the telescope in Problem 80 if possible, and they have this discussion: Avi: These are the same lenses we used to make a telescope. So they wont work as a microscope. Microscopes are for looking at close objects; telescopes are for looking at far objects. Cameron: All you need for a microscope are two converging lenses. I think the difference from a telescope is just that the order of the lenses is switched. A microscope is just a backward telescope. Shannon: I think the order of the lenses doesnt matter because the magnification is inversely proportional to both focal lengths. I think we have to adjust the distance between the lenses. a. What do you think? b. If a microscope can be constructed with these two lenses, describe its design. What is the minimum separation of the lenses? Where must you place the object?arrow_forwardWhat is the amount of magnification of a refracting telescope whose objective lens has a focal length of 1.0 m and whose eyepiece has a focal length of 25 mm? а. х 8.0 O b.x 40 Ос. х 32 d.x 16 О е.х 24arrow_forwardA microscope in the lab uses a lens with a focal length of 8.0 mm and an eyepiece with a focal length of 18 mm. The distance between the lens and the eyepiece is 19.7 cm. We use the microscope so that the eyes focus as if the object were placed infinitely far away. We treat the lenses as if they were "thin". b) How much linear magnification does the lens (alone) give?c) How much magnification does the eyepiece give alone?d) How is magnification defined for a microscope?e) What is the magnification of this microscope?arrow_forward
- Problem 99. A) How is a good single-lens camera (one that can be "focused") able to take clear pictures of objects that are a variety of distances from the camera? B) How is the eye able to place clear images on the retina of objects that are a variety of distances from the eye? C) For a fixed focus camera to take clear pictures, the object distance must satisfy a certain inequality. What is this inequality? D) Why does the nearpoint increase as people age?arrow_forwardThe CCD detector in a certain camera has a width of 8 mm. The photographer realizes that with the lens she is currently using, she can’t fit the entire landscape she is trying to photograph into her picture. Should she switch to a lens with a longer or shorter focal length? Explain.arrow_forwardA camera lens used for taking close-up photographs has a focal length of 28.4 mm. The farthest it can be placed from the film is 24mm. Part (a) What is the closest object that can be photographed in mm? Part (b) What is the magnification of this closest object? Part (c) What is the power of the lens?arrow_forward
- For this problem, I know the answer is A but I do not know how to get there. Seeing the steps and equations would be much appreciated. Thank youarrow_forwardWhat is the magnification of an astronomical telescope whose objective lens has a focal length of 77 cm and whose eyepiece has a focal length of 2.6 cm? Follow the sign conventions What is the overall length of the telescope when adjusted for a relaxed eye? Express your answer to two significant figures and include the appropriate units.arrow_forwardA camera lens used for taking close-up photographs has a focal length of 25.0 mm. The farthest it can be placed from the film is 30.0 mm. (a) What is the closest object (in mm) that can be photographed? ANS: ___ mm What is the magnification of this closest object? ANS: _____ Xarrow_forward
- The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft.a. What is the refractive power of this lens?b. What focal length (mm) eyepiece would give a magnificationof 1000× for this telescope?arrow_forwardPROBLEM The Hubble Space Telescope is 13.2 m long, but has a secondary mirror that increases its effective focal length to 57.8 m. The telescope doesn't have an eyepiece because various instruments, not a human eye, record the collected light. It can, however, produce images several thousand times larger than they would appear with the unaided human eye. What focal-length eyepiece used with the Hubble mirror system would produce a magnification of 8.00 x 103? STRATEGY The equation for telescope magnification can be solved for the eyepiece focal length. The equation for finding the angular magnification of a reflector is the same as that for a refractor. SOLUTION Solve for f, in the the magnification 57.8 m m equation and substitute values. fe m 8.00 x 103= 7.23 x 10-3 m LEARN MORE REMARKS The light-gathering power of a telescope and the length of the baseline over which light is gathered are in fact more important than a telescope's magnification, because these two factors contribute…arrow_forwardChapter 25: Problem 14: Consider a camera whose lens has a 41 mm focal length. a) What is the power P, in diopters, of the camera lens?arrow_forward
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