712 



LIGHT ABSORPTION BY PIGMENTS IN VIVO 



CHAP. 22 



when their optical path in the leaf is increased by scattering. On the other 

 hand, a certain proportion of radiations that would be almost completely 



010 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 



"TRANSPARENT" REFLECTED LIGHT, ( R' + P')/q' 



Fig. 22.37. Nomograph for determination of absorption and scattering coefficients in 

 turbid media for diffuse reflection and transmission measurements (after Duntley). 



(22.14) 



R' + P' 



Q' 



ad sinh Kd 



(22.15) log — + log Q' = log 



{ad + ad) sinh Kd + Kd cosh Kd 



{ad + ad) sinh Kd + Kd cosh Kd 



Kd 



(22.16) Kd/K = Vad {ad + 2ad) 



absorbed if forced to pass straight through the leaf (e. g., blue-violet or red 

 light) will be enabled to escape from it by diffuse reflection, which shortens 

 the optical path in the leaf. Therefore, in a plot of log (I/S) versus X 



