![]() The left photo shows a diffraction ring around the rising Sun caused by a veil of aerosol. It is different from rainbows and halos, which are mainly caused by refraction. This resembles an atmospheric Airy disc but is not actually an Airy disk. The most distinct part of this pattern is a central, nearly white disk. The result is a pattern of rings, which seem to emanate from the Sun, the Moon, a planet, or another astronomical object. This degree of bending of light depends on the wavelength (color) of light and the size of the particles. When light travels through thin clouds made up of nearly uniform sized water or aerosol droplets or ice crystals, diffraction or bending of light occurs as the light is diffracted by the edges of the particles. See also: Atmospheric optics Solar diffraction ring (Note: some sound may be propagated through the object depending on material). However, if the object has a diameter greater than the acoustic wavelength, a 'sound shadow' is cast behind the object where the sound is inaudible. The sound waves bend appreciably around the solid object. This produces the effect of being able to hear even when the source is blocked by a solid object. ![]()
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