Glass is see-through to your eyes, but not to a thermal camera.Thermal cameras detect long-wave infrared (heat).

Glass is see-through to your eyes, but not to a thermal camera.Thermal cameras detect long-wave infrared (heat). Ordinary glass absorbs those wavelengths instead of letting them pass, so it looks opaque, and often reflects your own heat back at you.That’s why thermal lenses aren’t made of glass.Science and facts💡