Source: wikibot/optical-depth-astrophysics
= Optical depth (astrophysics)
{wiki=Optical_depth_(astrophysics)}
Optical depth is a concept used in astrophysics and other fields to quantify how opaque a medium is to radiation, such as light. It provides a measure of how much a beam of light is attenuated as it passes through a medium, such as gas or dust.