The answer is zero.
According to below table we can see:
In spectrophotometry, absorbance and transmittance are measurements. Spectrophotometry determines how much radiant energy a substance absorbs at different light wavelengths. The technique is useful for determining the identity of an unknown substance as well as determining the concentration of a substance in a sample using a set of standards.
In the lab or in the field, a transmittance to absorbance table allows for quick conversion of transmittance values to absorbance.
Transmittance Absorbance (AU)
100% 0
99% 0.004
98% 0.009
97% 0.013
96% 0.018
What is absorbance?
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