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astr101_09_TelescopesLight.pdf - Astronomy 101 Telescopes...

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Astronomy 101Telescopes and Light
A Telescope is a tool used togather light from objects inthe universe
There are two different types oftelescopesArefractingtelescope uses aglass lenstoconcentrate incoming lightAreflectingtelescope usesmirrorstoconcentrate incoming starlight
Basic Telescope DesignRefracting: lensesRefracting telescopeYerkes 1-m refractor
A refracting telescope uses a lens toconcentrate incoming light
Basic Telescope DesignReflecting: mirrorsMost research telescopestoday are reflectingReflecting telescopeGemini North 8-m
Reflecting telescopes use mirrors toconcentrate incoming starlight
Three Main Functions of a TelescopeMost important!!Gather more light: making objects appear brighterFollowed byTo see fine detail (resolution)Least important:Magnify8
A largerprimary mirrorprovides abrighter (notbigger) image
Light Gathering PowerThe bigger the telescope, the more lightyou collect from a starThink of a telescope as a bucket collectingraindrops; the bigger the bucket(telescope), the more rain (light) it collects
ResolutionThe bigger thetelescope, the finer thedetail you can pick out

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Term
Winter
Professor
bennert
Tags
Astronomy, Light, Wavelength, Hubble Space Telescope, Refracting telescope

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