Fill in the Blanks Beer's Law RelationshipsOnline version Fill in the blanks to identify variables in Beer's Law. by Heather Holmes 1 absorptivity ebC Beer's transmittance absorbed P power after Po smaller concentration before length path transmitted The measured absorbance of a sample is equal to the negative log of the , which is defined as divided by . Po is defined as the power of light the sample , while P is the of light the sample . P will always be than Po because the sample has some of the light ( some light is not through the sample ) . The measured absorbance is also equal to the molar times the - times the of the sample . The equation for this is A = , and it's known as law .