Astro- Ch.6 Light and Telescopes- Quiz 2/3
About this set
Created by:
farinada on November 15, 2010
Subjects:
foundations of astronomy 10th edition
Description:
Manheim Township Astronomy: The Sky and The Stars
Classes:
MTWP Astronomy- The Sky and The Stars
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15 terms
Terms | Definitions |
|---|---|
 achromatic lens | A telescope lens composed of two lenses ground from different kinds of glass and designed to bring two selected colors to the same focus and correct for chromatic aberration. |
| reflecting telescope | A telescope that uses a concave mirror to focus light into an image. |
| light-gathering power | The ability of a telescope to collect light; proportional to the area of the telescope objective lens or mirror. |
| resolving power | The ability of a telescope to reveal fine detail; depends on the diameter of the telescope objective. |
| diffraction fringe | Blurred fringe surrounding any image caused by the wave properties of light. Because of this, no image detail smaller than the fringe can be seen. |
| magnifying power | The ability of a telescope to make an image larger. |
| light pollution | The illumination of the night sky by waste light from cities and outdoor lighting, which prevents the observation of faint objects. |
| prime focus | The point at which the objective mirror forms an image in a reflecting telescope. |
| secondary mirror | In a reflecting telescope, the mirror that reflects the light to a point of easy observation. |
| Cassegrain focus | The optical design of a reflecting telescope in which the secondary mirror reflects light back down the tube through a hole in the center of the objective mirror. |
| Newtonian focus | The focal arrangement of a reflecting telescope in which a diagonal mirror reflects the light out the side of the telescope tube for easier access. |
| Schmidt-Cassegrain focus | The optical design of a reflecting telescope in which a thin correcting lens is placed at the top of a Cassegrain telescope. |
| sidereal drive | The motor and gears on a telescope that turn it westward to keep it pointed at a star. |
| equatorial mounting | A telescope mounting that allows motion parallel to and perpendicular to the celestial equator. |
| alt-azimuth mounting | A telescope mounting capable of motion parallel to and perpendicular to the horizon. |
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