In the year 1800, Sir William Herschel discovered the existence of infrared by performing an experiment very similar to the one we show here.Herschel passed sunlight through a prism. As sunlight passes through the prism, the prism divides it into a rainbow of colors called a spectrum.n the year 1800, Sir William Herschel discovered the existence of infrared by performing an experiment very similar to the one we show here.
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