21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 6, Problem 16QP
To determine
The main disadvantage of telescope with simple lens over a refracting telescope.
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Lens A has a maximum magnifying power M = 2. Lens B has a maximum magnifying power M = 6. If these two lenses were put together to make a telescope, what would be the magnifying power of that telescope?
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Chapter 6 Solutions
21st Century Astronomy
Ch. 6.1 - Prob. 6.1ACYUCh. 6.1 - Prob. 6.1BCYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QPCh. 6 - Prob. 2QPCh. 6 - Prob. 3QPCh. 6 - Prob. 4QP
Ch. 6 - Prob. 5QPCh. 6 - Prob. 6QPCh. 6 - Prob. 7QPCh. 6 - Prob. 8QPCh. 6 - Prob. 9QPCh. 6 - Prob. 10QPCh. 6 - Prob. 11QPCh. 6 - Prob. 12QPCh. 6 - Prob. 13QPCh. 6 - Prob. 14QPCh. 6 - Prob. 15QPCh. 6 - Prob. 16QPCh. 6 - Prob. 17QPCh. 6 - Prob. 18QPCh. 6 - Prob. 19QPCh. 6 - Prob. 20QPCh. 6 - Prob. 21QPCh. 6 - Prob. 22QPCh. 6 - Prob. 23QPCh. 6 - Prob. 24QPCh. 6 - Prob. 25QPCh. 6 - Prob. 26QPCh. 6 - Prob. 27QPCh. 6 - Prob. 28QPCh. 6 - Prob. 29QPCh. 6 - Prob. 30QPCh. 6 - Prob. 31QPCh. 6 - Prob. 32QPCh. 6 - Prob. 33QPCh. 6 - Prob. 34QPCh. 6 - Prob. 35QPCh. 6 - Prob. 36QPCh. 6 - Prob. 37QPCh. 6 - Prob. 38QPCh. 6 - Prob. 39QPCh. 6 - Prob. 40QPCh. 6 - Prob. 41QPCh. 6 - Prob. 42QPCh. 6 - Prob. 43QPCh. 6 - Prob. 44QPCh. 6 - Prob. 45QP
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- Saturn has an angular diameter of 20 arcseconds (9.7×10-5 rad). You want to observe Saturn with a telescope. The focal length of the telescope’s objective is 1100 mm. To see Saturn’s rings clearly, you want the telescope to have a magnification of -50. What is the focal length of the eyepiece you need for this observation? What is the distance between the objective and the eyepiece?arrow_forwardIf a telescope has 2 converging lens, with an eyepiece that has a focal length of 3cm, and the object having a focal length of 90cm, what would be the total magnification that the telescope has?arrow_forwardA telescope has an objective lens with a focal length of 82 cm and an eyepiece with a focal length of 2.8 cm. What is the magnification of this telescope? What is the length of the telescope when adjusted for a relaxed eye?arrow_forward
- A small telescope has a concave mirror with a 2.50 m radius of curvature for its objective. Its eyepiece is a 3.80 cm focal length lens. (a) What is the telescope's angular magnification? (b) What angle in degrees is subtended by a 26,500 km diameter sunspot? (c) What is the angle in degrees of its telescopic image? (Include the sign of the value in your answer.)arrow_forwardA telescope has an objective lens having a focal length of 10 m and a diameter of 100 cm. What is the magnification provided by this telescope if its eyepiece has a focal length of 5 cm?arrow_forwardYou are taking a picture of a giraffe that is standing far away from you. The image is just too small, so you swap the 50-mm-focal-length lens in your camera for a 600 mm telephoto lens. By what factor does this increase the size of the image?arrow_forward
- The objective mirror of a telescope has a diameter of 5000 mm and a focal length of 8000 mm. An eyepiece has a focal length of 40 mm. What is the magnification of the telescope using this eyepiece?arrow_forwardPeople are often bothered when they discover that reflecting telescopes have a second mirror in the middle to bring the light out to an accessible focus where big instruments can be mounted. “Don’t you lose light?” people ask. Well, yes, you do, but there is no better alternative. You can estimate how much light is lost by such an arrangement. The primary mirror (the one at the bottom in Figure 6.6) of the Gemini North telescope is 8 m in diameter. The secondary mirror at the top is about 1 m in diameter. Use the formula for the area of a circle to estimate what fraction of the light is blocked by the secondary mirror. Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.arrow_forwardThe length of a telescope is 1 m. If the focal length of the eyepiece is 2 cm, what is the magnification of this telescope? 100 50 20 48 49 10 52arrow_forward
- A telescope is used to resolve two distant stars. By what factor will the resolution of the telescope change if the diameter of the lens is doubled? a)The resolution will increase by a factor of 4 b)The resolution will increase by a factor of 2 c)The resolution will not change, although more light will be collected. d)The resolution will decrease by a factor of 2 e)The resolution will decrease by a factor of 4 f)arrow_forwardQ5: A refracting telescope has the objective lens of focal length (10 m). Assume it is used with an eyepiece of focal length (2 cm). What is the magnification of this telescope?arrow_forwardTelescopes do more than just magnify images. In fact, if all they did was magnify images Galileo would have never seen the moons of Jupiter. What other important thing does the telescope do? a)The telescope is better at tracking movement than the naked eye is. b)The telescope is able to take disorderly rays and collimate them. c)The telescope is able to discern more colors than the naked eye can. d)The telescope is able to gather more light than the naked eye can. Kepler's design allowed him to achieve better image quality and higher magnifications than Galileo's. However, his design has a significant drawback. What is it? a) Kepler's telescope has rays intersecting each other, which creates the possibility that they will interfere with each other. b) Kepler's telescope is less able to collimate chaotic incoming light. c) Kepler's telescope collects less light. d) Kepler's image is inverted, while Galileo's is upright.arrow_forward
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