Question

Find the optical density and transmittance of 0.04%-lactise solution, if 1/8 of initial light intensity is absorbed in it

Answer 1

Transmittance:

$$T=1-\frac{1}{8}=0.875$$

The optical density (or absorbance) is then:

$$D=−\log _{10} ​ T=−\log _{10} ​ 0.875≈0.058$$