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| 1 |  |  What is meant by the term collecting area? How does it affect the ability to see faint objects? |
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| 2 |  |  What is resolution of a telescope? What physical process limits it? |
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| 3 |  |  How is resolution affected by the size of a telescope’s mirror or lens? |
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| 4 |  |  What is the difference between a reflecting and a refracting telescope? |
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| 5 |  |  What are some reasons for using mirrors rather than lenses in telescopes? |
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| 6 |  |  What is the purpose of an interferometer? |
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| 7 |  |  Why do astronomers put X-ray observatories in space rather than just on a high mountain? |
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| 8 |  |  What is meant by adaptive optics? |
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