抄録
Barkas' analysis (Proc. Phys. Soc. 51, 274, (1939)), in which the scattered light is decom-posed into specular and diffuse components and is treated geometrically, is tried on the light scattered by the surface of paper. Several kinds of printing paper and filter paper, white and dyed by diluted red ink, are used for experiment. Results obtained are as follows:
1. For highly glossy papers, the analysis is not applicable as it gives a negative value for the diffuse component.
2. Although the analysis is formally admissible for less glossy papers, there is no sound physical ground to designate two independent components, specular and diffuse, as the former varies considerably with the power of absorption of the paper.
3. That the analysis does, not explain the diffuse reflection is due to the fact that the so-called specular reflection does not follow Fresnell's formula.
