When Isaac Newton began using Galileo's telescope more than a century
later, he noticed a problem. The type of telescope that Galileo designed is called a
refractor because the front lens bends, or refracts, the light. However, the curved
front lens also caused the light to be separated into colors. This meant that when
Newton looked through the refracting telescope, the images of bright objects
appeared with a ring of colors around them. This sometimes interfered with
viewing. He solved this problem by designing a new type of telescope that used a
curved mirror. This mirror concentrated the light and reflected a beam of light to
the eyepiece at the other end of the telescope. Because Newton used a mirror, his
telescope was called a reflector.
When Isaac Newton began using Galileo's telescope more than a centurylater, he noticed a problem. The type of telescope that Galileo designed is called arefractor because the front lens bends, or refracts, the light. However, the curvedfront lens also caused the light to be separated into colors. This meant that whenNewton looked through the refracting telescope, the images of bright objectsappeared with a ring of colors around them. This sometimes interfered withviewing. He solved this problem by designing a new type of telescope that used acurved mirror. This mirror concentrated the light and reflected a beam of light tothe eyepiece at the other end of the telescope. Because Newton used a mirror, histelescope was called a reflector.
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