I want to apologize first of i post at the wrong section, not very sure if this is the right place for this post. First question, does the photon get absorbed when it hit highly reflecting material like mirror ? What make them look so different from the other transparent object? And I just read about the black body radiation, not sure if i get the right idea or not, but this is kind of confusing...Inside the thermos, it has a layer of shiny material, and they reflect radiation right? But when we close the opening, there is no light in the thermos, can i consider it as a black body? Or the radiation from the hot water is consider as a kind of "light" ? In refraction, i suppose that the photon pass through the object, the particle of the object didn't absorb the photon? Or they did but they emit them in the same direction? If so why don't reflecting material does the same thing?