Image formation in rough surfaces
Review articleOpen access
2004/08/15 Full-length article DOI: 10.1016/j.optcom.2004.05.005
Journal: Optics Communications
AbstractWhen a beam of light strikes a diffusive surface, like the surface of a paper or a ground glass, away from grazing incidence, it scatters rather evenly in all directions. But, at grazing incidence, i.e., at large incident angles, the specular reflection is more pronounced and increases by the increase of the incident angle. In the latter situation the image of the illuminating object could be observed. In this work, we study experimentally and theoretically the effective parameters involved in the image formation by a rough surface. It is shown that the interference of the lights diffused from parallel platelets located at different heights on a rough surface has dominant role. In polychromatic illumination the latter interference modifies the source spectrum. The presented approach can explain those mirages that are observed on roads and highways in situations that the total internal reflection conditions are not fulfilled in the air layers adjacent to the road surface.
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