Jovial Monk wrote on Aug 25^th, 2021 at 4:15pm:


Yes, this is because any light (or EM) in infrared range mainly is outside the transparency to visible light and to most of the spectrum before and after visible light frequencies , depending on the optical properties of the specific glass. This is because some of the photons are absorbed and not re-released immediately, that is, they push an electron to a higher energy stated and they remains that way until they drop to a lower energy level releasing a photon. (cooling down maybe by bumping to each other until the molecules on the outside can release the energy transferred as infrared photons. HEAT) I think