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The result is a luminous rainbow that contrasts with the darkened background. During such good visibility conditions, the larger but fainter secondary rainbow is often visible. It appears about 10° outside of the primary rainbow, with inverse order of colours. The rainbow effect is also commonly seen near waterfalls or fountains.
The word iridescence is derived in part from the Greek word ἶρις îris (gen. ἴριδος íridos), meaning rainbow, and is combined with the Latin suffix -escent, meaning "having a tendency toward". [1] Iris in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the ...
Glory around the shadow of a plane. The position of the glory's centre shows that the observer was in front of the wings. A glory is an optical phenomenon, resembling an iconic saint's halo around the shadow of the observer's head, caused by sunlight or (more rarely) moonlight interacting with the tiny water droplets that comprise mist or clouds.
Common optical phenomena are often due to the interaction of light from the Sun or Moon with the atmosphere, clouds, water, dust, and other particulates. One common example is the rainbow, when light from the Sun is reflected and refracted by water droplets.
Larger ice crystals do not produce iridescence, but can cause halos, a different phenomenon. [9] Irisation is caused by very uniform water droplets diffracting light (within 10 degrees from the Sun) and by first order interference effects [10] (beyond about 10 degrees from the Sun). It can extend up to 40 degrees from the Sun. [11]
The cause of the Rainbow Bridge deadly vehicle explosion remains something of a mystery, with investigators now exploring whether a mechanical failure in the car could be to blame.
Scheme of light pillars formation. Since they are caused by the interaction of light with ice crystals, light pillars belong to the family of halos.The crystals responsible for light pillars usually consist of flat, hexagonal plates, which tend to orient themselves more or less horizontally as they fall through the air.
The cause of the Rainbow Bridge deadly vehicle explosion remains something of a mystery, with investigators now exploring whether a mechanical failure in the car could be to blame.