What major physical phenomenon resulted from Herschel's accidental experiment involving sunlight and a prism?

Answer

The existence of infrared radiation

By measuring temperatures just outside the visible red spectrum and observing a temperature increase, Herschel inferred the presence of invisible light energy beyond the visible range.

What major physical phenomenon resulted from Herschel's accidental experiment involving sunlight and a prism?

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Sir William Herschel -- "The King's Astronomer" | David Rives

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