Week 3 DQ's

Week 3 DQ's - would be that they do not suffer from...

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1) What are the benefits and drawbacks of refracting telescope? How about a reflecting telescope? For what celestial objects are both best designed to observe? Refracting telescopes suffer from serious optical distortion that limits their usefulness, called chromatic aberration. This is a major drawback. When light is refracted through glass, shorter wavelengths bend more than longer wavelengths and blue light, having shorter wavelengths, comes to a focus closer to the lens than the red light does. Refracting telescopes are also very expensive. Reflecting telescopes are much less expensive because the light reflects from a thin layer of aluminum alloy on the front surface of the mirror. Another benefit for reflecting telescopes
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Unformatted text preview: would be that they do not suffer from chromatic aberration because the light is reflected from the metallic film on the front surface of the mirror and never enters the glass. Both kinds of telescopes form a very small, inverted image that is difficult to observe directly, so astronomers use a small lens called the eyepiece to magnify the image and make it convenient to view. Both the refracting telescope and the reflecting telescope are designed to observe starlight in the sky. 2) What do you think is more important. ..a telescope with larger diameter or one that is longer in focal length? Does it matter what you are observing? 3) What qualities can a star's spectra tell you about that star?...
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This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

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