In Beer's Law, which quantity does I denote?

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Multiple Choice

In Beer's Law, which quantity does I denote?

Explanation:
Beer's Law describes how light loses intensity as it passes through an absorbing medium. The symbol I refers to the light that exits the sample—the transmitted light. The incident light before the sample is I0, and the ratio I/I0 is the transmittance. Absorbance is defined from that ratio as A = -log10(I/I0) or A = log10(I0/I). The common exponential form uses I = I0 e^{-εlc} (or I = I0 10^{-εlc} depending on the base). So the quantity I denotes the transmitted light intensity.

Beer's Law describes how light loses intensity as it passes through an absorbing medium. The symbol I refers to the light that exits the sample—the transmitted light. The incident light before the sample is I0, and the ratio I/I0 is the transmittance. Absorbance is defined from that ratio as A = -log10(I/I0) or A = log10(I0/I). The common exponential form uses I = I0 e^{-εlc} (or I = I0 10^{-εlc} depending on the base). So the quantity I denotes the transmitted light intensity.

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