Answer:
Due to the inability of the measuring equipment to differentiate the transmittance when the value of the absorbance falls below 0.1 or above 1.
Step-by-step explanation:
Generally, measuring equipment is used to record the spectroscopy measurement of a substance in terms of the absorbance (A) or a percentage of the transmittance (T). These two variables are related mathematically as:
A = -log T
The relationship can also be shown using a graphical representation and it normally follows a straight line. However, when the value of the absorbance falls below 0.1 or above 1, the plot deviates from the normal straight-line curve due to the inability of the measuring equipment to differentiate the transmittance.