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Telescopes How do they work?
1. History 2. Lenses & Hardware   3. Reflecting Telescopes   4. Refracting Telescopes
History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why can’t you see an object that is far away? ,[object Object],[object Object],[object Object]
Lenses ,[object Object],[object Object],[object Object]
How does this apply to telescopes? ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
Diagram of a simple telescope. Parallel light rays enter from the left, pass through the objective lens, come to a focus at the focal plane, and exit through the eyepiece lens. The focal length of the objective is  F , and the focal length of the eyepiece is  f . www.ifa.hawaii.edu
[object Object],[object Object]
A telescope has two general properties  ,[object Object],[object Object],[object Object],[object Object]
The Aperture ,[object Object]
Magnification ,[object Object]
A closer look at eyepieces                                                                                                                           View through an eyepiece. Note that the image is upside-down.
Eyepiece ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Filters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
There are 2 main types of Telescopes ,[object Object],[object Object],[object Object]
Refractor Telescopes ,[object Object],[object Object],[object Object],[object Object],[object Object]
This is the simplest telescope design you could have. A big lens gathers the light and directs it to a focal point and a small lens brings the image to your eye.                                                                                                                                                                                                                                                    
Refracting telescopes are not used for astronomical research (anymore) because they are large and have heavy lenses (i.e. expensive).
Reflecting Telescopes ,[object Object],[object Object],[object Object]
Reflecting telescopes focus light by bending them with mirrors
Not everything is visible… ,[object Object],[object Object],www.yorku.ca/eye/spectrum.gif
Famous Telescopes ,[object Object],[object Object],[object Object],[object Object]
Very Large Array (VLA) radio telescopes

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Telescopes

  • 1. Telescopes How do they work?
  • 2. 1. History 2. Lenses & Hardware 3. Reflecting Telescopes 4. Refracting Telescopes
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8. Diagram of a simple telescope. Parallel light rays enter from the left, pass through the objective lens, come to a focus at the focal plane, and exit through the eyepiece lens. The focal length of the objective is F , and the focal length of the eyepiece is f . www.ifa.hawaii.edu
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. A closer look at eyepieces                                                                                                                           View through an eyepiece. Note that the image is upside-down.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18. This is the simplest telescope design you could have. A big lens gathers the light and directs it to a focal point and a small lens brings the image to your eye.                                                                                                                                                                                                                                                  
  • 19. Refracting telescopes are not used for astronomical research (anymore) because they are large and have heavy lenses (i.e. expensive).
  • 20.
  • 21. Reflecting telescopes focus light by bending them with mirrors
  • 22.
  • 23.
  • 24. Very Large Array (VLA) radio telescopes