![In1800, Herschel was testing filters for the sun so he could observe sun spots. When using a red filter he found there was a lot of heat produced. He discovered infrared radiation In1800, Herschel was testing filters for the sun so he could observe sun spots. When using a red filter he found there was a lot of heat produced. He discovered infrared radiation](https://c8.alamy.com/comp/T964M7/in1800-herschel-was-testing-filters-for-the-sun-so-he-could-observe-sun-spots-when-using-a-red-filter-he-found-there-was-a-lot-of-heat-produced-he-discovered-infrared-radiation-in-sunlight-by-passing-it-through-a-prism-and-holding-a-thermometer-just-beyond-the-red-end-of-the-visible-spectrum-this-thermometer-was-meant-to-be-a-control-to-measure-the-ambient-air-temperature-in-the-room-he-was-shocked-when-it-showed-a-higher-temperature-than-the-visible-spectrum-T964M7.jpg)
In1800, Herschel was testing filters for the sun so he could observe sun spots. When using a red filter he found there was a lot of heat produced. He discovered infrared radiation
![File:Glass prism, mounted at end of a brass tube, used by Sir William Herschel 10287820 H.jpg - Wikimedia Commons File:Glass prism, mounted at end of a brass tube, used by Sir William Herschel 10287820 H.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/4/4d/Glass_prism%2C_mounted_at_end_of_a_brass_tube%2C_used_by_Sir_William_Herschel_10287820_H.jpg)
File:Glass prism, mounted at end of a brass tube, used by Sir William Herschel 10287820 H.jpg - Wikimedia Commons
![Herschel-Planck infrared images of radiation and temperature within... | Download Scientific Diagram Herschel-Planck infrared images of radiation and temperature within... | Download Scientific Diagram](https://www.researchgate.net/profile/Rudolph-Schild/publication/231582477/figure/fig2/AS:300496259698696@1448655299660/Herschel-Planck-infrared-images-of-radiation-and-temperature-within-PGCs-reported-by-M_Q640.jpg)
Herschel-Planck infrared images of radiation and temperature within... | Download Scientific Diagram
![HerschelExperiment .pdf - Name Date Student Exploration Herschel Experiment Vocabulary electromagnetic radiation infrared radiation prism ultraviolet | Course Hero HerschelExperiment .pdf - Name Date Student Exploration Herschel Experiment Vocabulary electromagnetic radiation infrared radiation prism ultraviolet | Course Hero](https://www.coursehero.com/thumb/25/5d/255db22577b856b0e72800bf56a0af0f074cd63f_180.jpg)