The detector is used to measure the transmittance as well as the absorbance.
Through transmittance, the total light that passes through the sample is measured. Through absorbance, the total amount of light that can be observed by an object is measured.
The numbers that are generated on the spectrophotometer by the transmitter represent the total light given and that which is absorbed. By using these numbers we can measure the transmittance. The rate of transmittance as well as absorbance for each sample will be different.
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