Observed visible light in the 13th century
Sir Isaac Newton
Experimented with prisms in the 17th century
discovered infrared (increase in temperature just beyond the red end of the visible light spectrum) in 1800
observed that just beyond the violet end has the ability ot cause a chemical reaction with certain types of metals (UV) in 1801
generated and detected waves; expanded this experiment for higher frequencies - Radio waves and microwaves (in 1888)
discovered radiation while conducting experiments with cathode ray tubes - x-rays (1895)
discovered gamma rays (the "last" type of electromagnetic radiation)
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