Using a polarization analyzing apparatus and the method previously reported by the authori
1), reflection characteristics of several kinds of nonmetallic diffusing surfaces, most of which are white, are investigated. The results obtained are as follows:
1. A fairly satisfactory conclusion is arrived at by assuming that the specular component, reflected from the mirror facets, remains polarized without changing a plane of polarization and that the diffuse component, repeatedly reflected from and refracted at the small inner particles, is completely depolarized.
2. The diffuse component from coated paper, paint, tile and MgO having the reflectance of about 65_??_90% obeys Lambert's law, but that from uncoated paper and ground glass does not.
3. The specular component from roughly ground glass follows Fresnel's formula but, because of the interference effect, that from finely ground glass, glossy paper, paint and tile does not.
4. The distribution of the relative area of mirror facets of these surfaces having zero skewness resembles normal one although the kurtosis is somewhat larger, and the higher the gloss value or finer the roughness of the sample, the smaller the standard deviation.
5. With
wara-
banshi, MgO and roughly ground glass, when the angle of incidence or reflection is above about 50°, the so-called masking phenomenon takes place.
6. In some cases, the angle of reflectance maximum is not equal to that of specular reflection, which can be explained if the diffuse component, the relative area and the reflection coefficient of mirror facets are taken into considered.
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