Multiple Choice 1 point How did Herschel discover infrared light? He observed radioactive material that glowed and was , able to take a picture of the inside of his wife's hand He used a prism to divide light into all the visible colors of the rainbow He was measuring the temperatures of visible light and included a thermometer beyond the red light end of the spectrum. He noticed that the thermometer had a temperature and inferred that there was some kind of invisible light there. He observed light with special glasses that allowed him to see in the dark