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  • Mona Evans

    How a telescope works. A refractor is like a larger version of a seafarer's spyglass. It has a long tube with a main lens at one end to collect and focus light, and an eyepiece to magnify the resulting image. In the traditional Newtonian reflector the light focused by the primary mirror is bounced back up the tube to a small secondary mirror which diverts it into the eyepiece. [Image:] Mona Evans, "Choosing and Using a Telescope"

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