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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wikipedia → Joseph von Fraunhofer

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29%

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31%

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