Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 6, Problem 7Q
To determine
The good criterion for evaluating the telescope.
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Quite often advertisements appear for telescopes that extol their magnifying power. a) Is this a good criterion for evaluating telescopes? Explain your answer. b) What would be a better criterion for evaluating telescopes? Explain your answer.
A telescope is focused to infinity. The lenses of the telescope are +1.5 and +15 diopters. What is the length of this telescope?
You are using a telescope is to resolve two distant stars as well as possible.
Which of the following modifications will increase the resolution of the telescope?
Question 8 options:
Use a filter to filter out all but the red light.
Use a filter to filter out all but the blue light.
Use a lens of smaller diameter
Use a lens of larger diameter
None of these modifications will impact the resolution of the telescope.
Chapter 6 Solutions
Universe: Stars And Galaxies
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- People 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_forwardWhen astronomers discuss the apertures of their telescopes, they say bigger is better. Explain why.arrow_forwardYou have been asked to compare four proposals for telescopes to be placed in orbit above the blurring effects of the earth’s atmosphere. Rank the proposed telescopes in order of their ability to resolve small details, from best to worst. (i) A radio telescope 100 m in diameter observing at a wavelength of 21 cm; (ii) an optical telescope 2.0 m in diameter observing at a wavelength of 500 nm; (iii) an ultraviolet telescope 1.0 m in diameter observing at a wavelength of 100 nm; (iv) an infrared telescope 2.0 m in diameter observing at a wavelength of 10 mm.arrow_forward
- The large space telescope that has been placed into an Earth orbit has an aperture diameter of 1.4 meters. What angular resolution will this telescope achieve for visible light of wavelength 2 = 6.5 x 10-7 m? Write your answer in "seconds of arc".arrow_forwardwhat advantages does a catadioptric telescope have over a reflecting telescope? what is its disadvantages?arrow_forwardA Keplerian telescope has an objective lens of diameter 12 cm and focal length +90 cm, and an eyepiece of focal length +8 mm. It is used to observe Jupiter which has a true diameter of 140 000 km and a distance of 750 million km from Earth. Calculate the apparent angular diameter of Jupiter as seen through the telescope; give your answer in degrees.arrow_forward
- Which of the following pairings of telescope diameter and observational wavelength would give the best resolution images of an object with a telescope? Explain why you chose the telescope and wavelength combination you did, and calculate the angular resolution you could achieve with it. It would be best to observe with... Option 1: a 10 m diameter optical telescope on the ground with λ= 550 nm Option 2: a 2.4 m diameter optical telescope in space with λ=500 nm Option 3: a 100 m radio telescope on the ground with λ=100 cmarrow_forwardA charged-couple device (CCD) detector ismounted at the focus of an f/7 reflecting telescope with a D= 50 cm mirror. The CCD chip contains 1024×1024 pixels, with each square pixel being 10μm on a side. What is the area (in square arcminutes) of the sky that is imaged on the entire chip?arrow_forwardDefine magnifying power of a telescope. Write its expression.A small telescope has an objective lens of focal length 150cm and an eye piece of focal length 5cm. If this telescope is used to view a 100m high tower 3km away, find the height of the final image when it is formed 25cm away from the eye piece.arrow_forward
- In the dark, your pupil (the aperture of your eye) expands to a diameter of 7 mm. How many times more light can be gathered by a telescope with a 5.5 m diameter than by a fully dark- adapted eye? Increase in light gathered = I timesarrow_forwardWhich of the following items are usually seen as reasons why reflecting telescopes are more commonly used by astronomers than refracting telescopes? Select all that apply. Select one or more alternatives: Reflecting telescopes are less likely to distort images by treating different wavelengths of the light in different ways. Reflecting telescopes are easier to protect, because their mirrored surfaces are covered by glass. Reflecting telescopes are more easily pointed at specific objects. Large reflectors are easier to build than refractors. Reflecting telescopes were invented first, and have always been the primary tool of astronomers.arrow_forwardWhich of these is NOT one of the largest optical telescopes in the world? Answers: A. Southern African Large Telescope B. Hobby Eberly Telescope C. Yerkes Telescope D. Keck I Telescope E. Hale Telescopearrow_forward
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