On Tue, Jan 25, 2022 at 10:09 AM H LV <hveeder...@gmail.com> wrote: > > If you hold an infrared thermometer close to a mirror and point it at > the mirror does it take its own temperature? > > Harry >
This is another related thought experiment: Imagine a small round body with initial temperature T1 at the center of a spherical cavity. The radius of the cavity is continually growing and the interior surface of the cavity remains perfectly reflective. The spherical nature of the reflective cavity means all the radiation emitted by the body is continuously returned to the body. Will the body cool down or remain at the same temperature? Does your intuition diverge from theory? Harry
