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Ch 5 Telescopes
Vocabulary
| Term | Definition |
|---|---|
| Optical Telescope | observes electromagnetic radiation at visible wavelengths |
| Objective | lens that gathers light directly from an observed object |
| Eyepiece | lens that one looks through to observe an object (a.k.a. the ocular lens) |
| Refractor | telescope that uses a lens to gather and focus light from a distant object (a.k.a. a Galilean telescope) |
| Focus | focal point where light rays meet after being refracted or reflected |
| Focal Length | distance from a mirror or the center of a lens to the focus |
| Reflector | telescope that uses a mirror to gather and focus light from a distant object |
| Converging | convex lens or concave mirror that brings light rays together to a single focus |
| Prime Focus | reflecting telescope with a single primary mirror that focuses incoming light to a point |
| Newtonian Focus | reflecting telescope with a second mirror that deflects light out the side near the top |
| Cassegrain Focus | reflecting telescope with a second mirror that deflects light out of the bottom |
| Coude Focus | reflecting telescope with a third mirror that deflects light out the side near the bottom |
| Chromatic Aberration | when the focal point is located at a different distance from the lens for each color, causing blurring |
| Aperture | diameter of the light collecting region in a telescope |
| Collecting Area | total area of a telescope that is capable of capturing incoming radiation |
| Charge-Coupled Device (CCD) | composed of many pixels that record a buildup of charge to measure the amount of light striking it |
| Photometry | study of a source's brightness when measured through a set of filters |
| Photometer | device that measures the total amount of light received in an image |
| Angular Resolution | ability to distinguish between adjacent objects in the sky |
| Diffraction-Limited Resolution | depends on the wavelength of radiation and the diameter of a telescope |
| Image Processing | analysis and manipulation of a digitized image to improve its quality |
| Atmospheric Blurring | effects of turbulence in the atmosphere on viewing conditions |
| Seeing | ease with which good telescopic observations can be made from Earth's surface |
| Light Pollution | unwanted light that scatters back to Earth from dust, obscuring faint sky objects |
| Active Optics | adjustment of ground-based telescopes' mirrors in response to temperature and orientation |
| Adaptive Optics | adjustment of ground-based telescopes' mirrors in response to atmospheric turbulence |
| Radio Astronomy | studies objects using radio waves from the surface of the Earth |
| Interferometry | technique combing several telescopes to observe the same object simultaneously to improve resolution |
| Interferometer | two or more telescopes observing the same object to behave like one large telescope |
| Space-Based Astronomy | studies objects using higher energy radiation that cannot penetrate the atmosphere (e.g. x- & gamma rays) |
Created by:
john_bailey720
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