A First-Order Theory of Diffuse Reflecting and Transmitting Surfaces
Intensity of light emitted or reflected from a surface in accordance with Lambert's law varies in proportion to the cosine of the angle between the direction of the light beam and the normal to the surface. With many surfaces which do not follow this law, it is possible to approximate the variation of intensity with some power of the cosine. When such an approximation can be made, relatively simple relationships can be obtained for luminance (brightness), emittance and related factors. Use of this approach may take some of the mystery out of such problems as the determination of screen brightness and a study of transmission characteristics of process screens.
- Print ISSN
- 0898-042X
- Published
- 1953-07
- Content type
- Original Research
- DOI
- 10.5594/J04928
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