Simulation of this process can be facilitated with the "on-the-spot" approximation for the local diffuse field. A general solution for the dispersion function in this process is the so-called H-function developed by Chandrasekhar. Angle cosines of plus and minus one over root 3 are commonly used in the two-stream approximation for this process, which can be extended to the Eddington approximation of near-isotropy at large depth. Its grey approximation assumes a frequency-independent opacity, and its fundamental equation sets the source function minues the intensity equal to the derivative of the intensity with respect to the optical depth. It occurs in a diffusive fashion as the dominant energy transport mechanism in non-convective regions of stars. For 10 points, 
Simulation of this process can be facilitated with the "on-the-spot" approximation for the local diffuse field. A general solution for the dispersion function in this process is the so-called H-function developed by Chandrasekhar. Angle cosines of plus and minus one over root 3 are commonly used in the two-stream approximation for this process, which can be extended to the Eddington approximation of near-isotropy at large depth. Its grey approximation assumes a frequency-independent opacity, and its fundamental equation sets the source function minues the intensity equal to the derivative of the intensity with respect to the optical depth. It occurs in a diffusive fashion as the dominant energy transport mechanism in non-convective regions of stars. For 10 points, name this process of absorption and emission into a beam of light passing through a medium.
Simulation of this process can be facilitated with the "on-the-spot" approximation for the local diffuse field.
radiative transfer