Types of Telescope7

Types of Telescope7 - the light to a focus in one location...

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Types of Telescopes To overcome the size limits, another telescope design is usually used. If you have a curved surface which is highly reflective (like a mirror), the light could be brought into focus by having it bounce off the mirror at a certain angle. Since a mirror could be supported from behind, you can make a very large mirror! To focus the light, the best surface to use is a parabola (Figure 16), and this scheme is used in most large modern telescopes, not just those that you look through with your eye, but also radio, IR, etc. Currently most modern telescopes are of this type - reflecting telescopes . Figure 16. Basic design for a reflecting telescope. The curved mirror is in the shape of a parabola and this allows it to bring all of
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Unformatted text preview: the light to a focus in one location. You might have noticed that the light in a reflecting telescope is focused at a point in front of the mirror. If you wanted to look at the gathered light, you would have put yourself in front of the mirror. This doesn't seem like a very logical way to observe objects, since your head would be blocking some of the light. Actually, with some telescopes, this doesn't really make much difference, since the size of the light gathering area is huge in comparison to the size of your head. Often instruments can be placed at the main focus location, or the light can be bounced around by other mirrors to take it to a more convenient location. This is shown in Figure 17....
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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