Answer :
The correct answer is **a) William Herschel**.
William Herschel discovered infrared light, which is light "beyond the rainbow," in 1800. He used a prism to split sunlight into its spectrum and then measured the temperature just beyond the red part of the spectrum, finding it was higher, thus discovering infrared radiation.
William Herschel discovered infrared light, which is light "beyond the rainbow," in 1800. He used a prism to split sunlight into its spectrum and then measured the temperature just beyond the red part of the spectrum, finding it was higher, thus discovering infrared radiation.
