Who in 1801 discovered the ultraviolet radiation?

Benjamin Franklin
William Herschel
Johann Wilhelm Ritter
John Tyndall
UV radiation was discovered in 1801 when the German physicist Johann Wilhelm Ritter observed that invisible rays just beyond the violet end of the visible spectrum darkened silver chloride-soaked paper more quickly than violet light itself.
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Benjamin Franklin
William Herschel
Johann Wilhelm Ritter
John Tyndall
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