Lambert's law

noun

Definition of Lambert's law 

: either of two laws in physics:

a : cosine law

b : the negative logarithm of the transmittance of a layer of substance is proportional to the thickness of the layer, the constant of proportionality for natural logarithms being the absorption coefficient

called also Bouguer's law

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History and Etymology for Lambert's law

after J. H. Lambert, its formulator

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