the formula for converting absorbance to transmittance goes as:
a = log (1/t) a = 2 - log(%t) 10^a = 1/t t = 10^-a %t = 100(10^-a)
so at the given value of a, a = 1.5
%t = 100(10^-1.5)
%t = 3.16%
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