the telephone poles.2. Figure 10.48 shows a cross-section of Joey's toyperiscope. What will Joey see when he looks inthe periscope? Explain, using the laws of reflec-tion (trace the periscope). What would be a bet-ter way to position the mirror in the telescope?onil InmncemonOpen here. o5noradwod 519hOtheingdingthe wall1.The direcrson stLook in here.Figure 10.48 Joey's periscope.3. Figure 10.49 shows a sketch of a room that hasa pair of perpendicular mirrors, drawn from thefa fly on the ceiling. A personmirror

(2) Periscope is used to look around walls, corners or any other obstacles. Submarines have…

Answered: the telephone poles. 2. Figure 10.48…

Foundations of Astronomy (MindTap Course List)

14th Edition

ISBN:9781337399920

Author:Michael A. Seeds, Dana Backman

Publisher:Michael A. Seeds, Dana Backman

Chapter6: Light And Telescopes

Section: Chapter Questions

Problem 14P

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How much do binoculars help astronomical observations? Have you ever used binoculars for astronomy or anything else? Also why do many people say binoculars better to start with for astronomical observing versus a telescope?
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A 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?
The largest observatory complex in the world is on Mauna Kea, the tallest mountain on Earth. What are some factors astronomers consider when selecting an observatory site? Don’t forget practical ones. Should astronomers, for example, consider building an observatory on Denali (Mount McKinley) or Mount Everest?
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Telescopes can now be operated remotely from a warm room, but until about 25 years ago, astronomers worked at the telescope to guide it so that it remained pointed in exactly the right place. In a large telescope, like the Palomar 200-inch telescope, astronomers sat in a cage at the top of the telescope, where the secondary mirror is located, as shown in Figure 6.6. Assume for the purpose of your calculation that the diameter of this cage was 40 inches. What fraction of the light is blocked? 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.
A telescope is focused to infinity. The lenses of the telescope are +1.5 and +15 diopters. What is the length of this telescope?
The primary mirror on a telescope is able to resolve objects that are theta o apart. If you replace the mirror with one that has it in diameter six times smaller than the first what will be the angular resolution of the telescope
Calculate the horizontal distance between thestafi and instrument, if the staff readings are 1.4m and 2.9 m, which corresponds to lower andthe upper horizontal lines of cross hair. The lensof the telescope of the tachometer is of anallacticlens.
Spy planes fly at extremely high altitudes (25 km) to avoidinterception. If their cameras are to discern features assmall as 5 cm, what is the minimum aperture of the cameralens to afford this resolution? (Use λ=580nm )
Astronauts observing from a space station need a telescope with a resolving power of 0.5 arc second at a wavelength of 570 nm and a magnifying power of 280. Design a telescope to meet their needs. (State the necessary primary diameter of the telescope, in m, and the ratio of the focal lengths below.)
What is the minimum diameter mirror on a telescope thatwould allow you to see details as small as 5.00 km on theMoon some 384,000 km away? Assume an averagewavelength of 550 nm for the light received.

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