Kirchhoff's law of thermal radiation rarefied material such as air, or transparent material, through which observations can be made. The interface is not a material body and can neither emit nor absorb. It is a mathematical surface belonging jointly to the two media that touch it. It is the site of refraction of radiation that penetrates it and of reflection of radiation that does not. As such it obeys the Helmholtz reciprocity principle. The opaque body is considered to have a material interior that absorbs all and scatters or transmits none of the radiation that reaches it through refraction at the interface. In this sense
AACTA Award for Best Direction in a Television Light Entertainment or Reality Series AACTA Award for Best Direction in a Television Light Entertainment or Reality Series The AACTA Award for Best Direction in a Television Light Entertainment or Reality Series is an accolade given by the Australian Academy of Cinema and Television Arts (AACTA), a non-profit organisation whose aim is to "identify, award, promote and celebrate Australia's greatest achievements in film and television." The award is handed out at the annual AACTA Awards, which rewards achievements in feature film, television, documentaries and short films. Previously, direction for light entertainment and reality series were recognised in the Best Direction in Television category. However, when