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1Astro 102/1041Lecture #8: Astronomical Instruments•Astronomical Instruments:– Optics: Lenses and Mirrors.– Detectors.– Ground Based Telescopes:•Optical, Infrared, and Radio.– Space Based Telescopes.– Spacecraft Missions.Astro 102/1043The Main PointAstronomers are constantly trying to maximize the resolutionof their observations, but there are fundamental limits because of wavelength, telescope size, and the blurring effects of our atmosphere. Astro 102/1044Some Basics•Astronomers rely on instruments that collect, magnify, and/or disperselight.•How much light can be collected is determined by the apertureof the collecting instrument.•A combination of lensesor mirrorsare used to focus light onto a detector.•Dispersion is obtained using a prismor grating.•Detectors include photographic plates, photo-sensitive resistors, and silicon semiconductors.Astro 102/1045Familiar Optics•Telescopes operate on the same principles as your eyes.
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