If a sample transmits 75% of the incident light, its absorbance would be 0.125 Au.
The absorbance of a sample is calculated from the percentage of incident light transmitted using the following formula:
Absorbance = 2 – log(%T), where %T = percentage of incident light transmitted.
In this case, %T = 75, the formula becomes:
Absorbance = 2 - log 75
= 2 - 1.875
= 0.125 Au
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