Question

Find the optical density and transmittance for 15% glucose solution, if 1/3 of initial light intensity is absorbed in it.

Answer 1

The transmittance 

$$T=1-\frac{1}{3}=0.667$$

The optical density 

$$D=−\log _{ 10} ​ T=−\log_{ 10} ​ 0.667≈0.176$$