Compléter Beer's Law RelationshipsVersion en ligne Fill in the blanks to identify variables in Beer's Law. par Heather Holmes 1 before length smaller concentration transmittance Beer's Po absorptivity power P path ebC absorbed after 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 .