OU NanoLab/NSF NUE/Bumm & Johnson
Lambert’s Law of Absorption
if a beam of light decreases exponentially as it passes though a
uniform absorbing medium with the linear decay constant
In a uniform absorbing medium, the intensity of a beam of light
decreases by the same proportion for equal path lengths traveled.
The linear decay constant
is a characteristic of the medium.
It has units of
is the path length over which the intensity is attenuated to 1/
Lambert described how intensity changes with distance
in an absorbing medium.
Johann Heinrich Lambert
The distance traveled through the medium is called