Telescopes

Answers

THEORETICAL CONSIDERATIONS

1. gather light, aperture

2. magnitude, fainter

3. 100, 2.51 (fifth root of 100)

4. FAINTER

5. aperture

6. focal length

7. focal ratio

8. magnification

9. magnification

10. 96

11. resolution

12. aperture

13. 4.56 seconds of arc/aperture in inches

14. 0.023 second of arc

15. contrast

16. definition

17. field of view

*18. approximately ½ degree

19. seeing

20. summer

21. transparency

22. transparency, seeing

23. Bad seeing conditions increase the size of the diffraction disk which is responsible for resolution.

24. diffraction or Airy or false

*25. aperture, SMALLER

*26. Larger apertures produce smaller diffraction disks which allow for higher magnification before tolerances are exceeded.

*27. contrast

*28. bent, diffraction, bad

*29. More light is focused into the diffraction rings which are not responsible for the formation of the image.

*30. same answer as 29

*31. "Starlike" images are the result of unwanted diffraction caused by the supports which secure the secondary mirror in reflecting telescopes.

*32. 5500 Å

*33. 10-8 cm or 3.94 x 10-9 inch

*34. 1375 Å or ¼ wave

LAWS OF LIGHT

35. normal

36. reflection

37. toward

*38. refraction, incidence, refraction, refraction

39. electromagnetic

40. visible

41. waves and bullets

42. refraction

43. dispersion

DIFFERENT TYPES OF TELESCOPES

44. objective

45. refractor

46. reflector

47. catadioptric

48. Hans Lippershey

49. Galileo Galilei

50. chromatic

51. plano-convex

52. astronomical, crown, flint

53. Isaac Newton, chromatic aberration

54. finder

55. eyepiece

56. mount

57. spider or secondary support or holder

58. Newtonian

59. They are too bulky because of excessive tube lengths.

60. sphere

61. spherical aberration

62. parabola

*63. astigmatism

64. Cassegrainian (compound)

65. focal length

66. SHORT

67. IN BACK

68. catadioptric

69. Schmidt Cassegrainian, Maksutov Cassegrainian

70. sphere

71. spherical

72. parabolization

*73. Schmidt camera, LARGE

74. richest field or RFT, large