Who invented the spectroscope?
Issac Newton
William Herschel
Joseph van Fraunhofer
Edwin Hubble
Joseph Ritter von Fraunhofer was a Bavarian physicist and optical lens manufacturer. He made optical glass and achromatic telescope objective lenses, invented the spectroscope, and developed diffraction grating. 
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Issac Newton
William Herschel
Joseph van Fraunhofer
Edwin Hubble
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