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Chapter 03: Telescopes Sample Test Questions 1. Galileo is credited with designing the first reflector telescope. Radio astronomy can only be done...

The simplest reflector telescope design is the
prime focus reflector

1. Galileo is credited with designing the first re- flector telescope. 2. The simplest reflector telescope design is the prime focus reflector. 3. Chromatic aberration affects reflector tele- scopes. 4. All optical telescopes will bring the light from a star to a focus. 5. A telescope design that uses a lens and no mir- rors is a refractor. 6. CCD detectors gather light 10-20 times faster than the most sensitive photographic film. 7. A Newtonian reflector needs no secondary mir- ror. 8. The Hubble Space Telescope gives us its best resolution with x-rays. 9. The Cassegrain reflector needs a primary con- cave main mirror and a smaller, convex secon- dary mirror to reflect light back through a hole in the primary. 10. Photography with film is still the preferred way of capturing fine detail in the faintest, most dis- tant galaxies. 11. The light gathering ability of a telescope is most dependent on the diameter of it's primary objec- tive. 12. Mt. Palomar's 200" Hale telescope is the largest reflector now in service. 13. A telescope with an 8 inch mirror will collect twice as much light as one with a 4 inch mirror. 14. The 400" Keck reflector can see objects 100 × fainter than the 40" Yerkes lens. 15. Radio telescopes have poor resolution compared to optical scopes, since radio waves have much longer wavelengths than optical ones. 16. All modern large optical telescopes are refrac- tors. 17. Stars do not twinkle; the instability of the at- mosphere causes this effect. 18. The opacity of the atmosphere is partially cor- rected via adaptive optics. 19. In the future, adaptive optics will greatly en- hance the resolution of the Hubble Space Tele- scope. 20. Optical telescopes are usually used only at night, but radio telescopes can be used day or night. 21. The earth's atmosphere is the major factor limit- ing the resolution of ground-based radio tele- scopes. 22. Optical interferometry is more in use than radio interferometry. 23. Radio astronomy can only be done from up in space, due to our ionosphere. 24. Like radio and optical astronomy, infrared as- tronomy is easily done with ground-based tele- scopes. 25. Due to our ozone layer, ultraviolet astronomy is best done above the atmosphere. 26. The mirrors for x-ray telescopes are the same shape as those of optical reflectors. 27. The Compton GRO was the first telescope used for our exploration of high energy astronomy. 28. Galaxies look the same whether viewed in visible or x-ray wavelengths. 29. Which type of telescope has the simplest light path? A) prime focus reflector B) achromatic refractor C) Newtonian reflector D) single lens refractor E) Cassegrain reflector 30. Which type of telescope did Galileo turn skyward in 1610? A) single lens refractor B) achromatic refractor C) Cassegrain reflector D) Newtonian reflector E) prime focus reflector 31. What problem do refractor telescopes have that reflectors don't? A) diffraction limited resolution B) bad seeing C) chromatic aberration D) spherical aberration E) light loss from secondary elements 32. The most important advantage of CCDs over film is that A) their images do not have to be developed as film does. B) they record much more light in a given expo- sure time. C) their images never fade, as film can. D) they record colors better than film can. E) they can cover larger areas of the sky than film can. 33. The primary purpose of a telescope is to A) separate light into its component wave- lengths B) make distant objects appear nearby C) measure the brightness of stars very accu- rately D) magnify distant objects E) collect a large amount of light and bring it into focus Chapter 03: Telescopes Sample Test Questions
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34. A major advantage of a Newtonian reflector over a refractor is A) the central hole in the mirror is smaller. B) there are only two lenses to grind. C) the elimination of the secondary mirror. D) the elimination of chromatic aberration. E) its compact size. 35. Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows A) effects of atmospheric turbulence to be re- duced. B) more light to be gathered. C) chromatic aberration to be reduced. D) x-rays to be focused. E) greater magnification. 36. It is diffraction that limits the ___ of a tele- scope's objective. A) magnification B) frequencies C) wavelengths D) light grasp E) resolution 37. The angular resolution of an 8 inch diameter telescope is __ greater than that of a 2 inch diameter telescope. A) 2 × B) 4 × C) 8 × D) 9 × E) 16 × 38. The amount of diffraction and thus the resolu- tion of the scope depends upon A) whether the telescope is a reflector or re- fractor. B) the size and sensitivity of the CCD chip used for imaging. C) the design of the telescope. D) the brightness of the object. E) the wavelength used and the size of the main telescope objective lens or mirror. 39. What is the resolution of a telescope? A) its ability to separate light into its compo- nent colors for analysis B) its ability to make distant objects appear much closer to us C) its ability to see very faint objects D) its ability to distinguish two adjacent ob- jects close together in the sky E) its ability to focus more than just visible light for imaging 40. Compared to a 5 inch prime focus reflector, a 5 inch Newtonian reflector will A) will have more chromatic aberration. B) have the same light gathering power. C) will have a larger hole in the center of its mirror. D) have more light gathering power. E) be easier to build. 41. What is the light-gathering power of an 8 inch telescope compared to a 4 inch telescope? A) 2 × better B) 4 × better C) 8 × better D) 16 × better E) 32 × better 42. Green light has a shorter wavelength than or- ange light. In a 5 inch telescope, green light will A) allow dimmer stars to be observed. B) reduce the effects of atmospheric turbu- lence. C) come to the same exact focus as orange light. D) provide worse angular resolution than or- ange light. E) provide better angular resolution than or- ange light. 43. What problem does adaptive optics correct? A) defects in the optics of the telescope, such as the original Hubble mirror B) the opacity of the earth's atmosphere to some wavelengths of light C) turbulence in the earth's atmosphere which creates twinkling D) chromatic aberration due to use of only a single lens objective E) the light pollution of urban areas 44. What is true of radio telescopes? A) They have better angular resolution than a reflector. B) They are the smallest, most compact tele- scopes. C) They can only be used above the atmos- phere. D) They are most sensitive to the opacity of the ozone layer. E) They have poorer angular resolution than a refractor. 45. The Arecibo radio telescope is laid out like which optical telescope design? A) Cassegrain reflector B) prime focus reflector C) Newtonian reflector D) Coude reflector E) grazing incidence reflector 46. In astronomy, an interferometer can be used to A) speed up the processing of CCD images B) yield better seeing conditions with optical telescopes C) improve the angular resolution of radio tele- scopes D) decrease the effects of light pollution in get- ting darker sky backgrounds E) increase the sensitivity of infrared tele- scopes to longer wavelengths Chapter 03: Telescopes Sample Test Questions
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