light and telescopes
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16 terms
Terms | Definitions |
|---|---|
 electromagnetic radiation | changing electric and magnetic fields that travel through space and transfer energy fro on eplace to another for example, light, radio waves, and the like |
| photon | a quantum of electromagnetic energy, carries an amount of energy that depends inversely on its wavelength |
| wavelength | the distance between succesive peaks or troughs of a wave |
| ultraviolet radiation | electromagnetic radiation with wavelengths shorter than visible light but longer than X rays |
| frequency | the number of times a given event occurs in a given time, for a wave the numner of of cycles that pass the observer in 1 second |
| refracting telescope | a telescope that forms images by bending light with a lens |
| reflecting telescopes | a telescope that uses a concave mirros to cofus light into an image |
| light gathering power | the abolity of a telescope to collect light, proportional to the area of the telescope objective lens of mirror |
| resolving power | the ability of a telescope to reveal fine detail, depends on the diameter of the telescope objective |
| seeing | atmospheric conditions on a given night. When the atmosphere is unsteady, producting blurred images, the seeing is said to be poor |
| 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 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 |
| charge coupled devises (ccd) | an electronic devise consisting of a large array of light sensitive elements used to record very faint images |
| grating | a piece of material in which numerous microscopic parrallel lines are scribed; light encountering a grating is dispersed to form a spectrum |
| spectrograph | a device that separates light by wave length to produce a spectrum |
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