Optical depth
natural logarithm of the ratio of incident to transmitted radiant power through a material; the absorbance × ln(10) From Wikipedia, the free encyclopedia
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Optical depth is a measure of transparency. It is defined as the fraction of radiation (or light) that is scattered or absorbed on a path. One way of visualizing optical depth is to think of a fog. The fog between a person and an object that is immediately in front of them has an optical depth of zero. As the object moves away, the optical depth increases until it reaches a large value and the object is no longer visible.
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