Beer Lambert Law

as expressed by chemists for analytical purposes considers only transmittance which can include effects of both scattering and absorption

The transmission of light through coffee and milk in petri dishes shows the point of this, in scattering we can see that one is dark the other bright, but in transmission both are the same.

Transmission = 1 - Extinction Extinction = scattering + absorption

Single Scattering Albedo is a parameter that emphasizes this dichotomy, and varies from 0 (absorption dominant) to 1 (scattering dominant)

Wiens Displacement Law

describes the emission of the sun and the earth. Each behaves somewhat as a black body at a characteristic temperature.

In this cloud sensing class the UV part (TOMS) mainly considers reflected solar derived energy while the IR data from GOES, AVHRR and MODIS is mainly derived from the earth. A fundamental lecture review of these points is found in most remote sensing books.