Term
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Definition
| an instrument used to gather and focus light |
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Term
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Definition
| uses a glass lens as its objective |
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Term
| Advantages of using a Refractor telescope |
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Definition
| 1) These telescopes are rugged 2) The glass surface on your objective isin G sealed casing protected from the environment 3) Sharper image |
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Term
| Disadvantages of using a Refractor telescope |
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Definition
| 1) chromatic aberration 2) only good for visible light 3) How well light passes through depends on the thickness of your lens 4) Difficult to make a perfect lens |
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Term
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Definition
| color deviation/ distorting |
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Term
| Ways to correct chromatic aberration |
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Definition
| 1) use multiple compensating lines 2) use a very long objective focal length |
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Term
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Definition
| uses a mirror as its objective |
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Term
| Advantages of using a reflecting telescope |
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Definition
| 1) Do not suffer from chromatic aberration 2) these can be big 3) These are cheaper 4) Only one side of the objective needs to be perfect |
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Term
| Disadvantages of using a reflecting telescope |
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Definition
| 1) Easy Doge optics out of alignment 2) need cleaning, because it is Not closed to the atmosphere 3) When a secondary (2°) mirror is used, sometimes bright objects can get spikes 4) Can suffer from A defect called spherical aberration |
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Term
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Definition
| not all light is focused on the same point |
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