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Line 5: − Although the rainbow is sometimes fancifully depicted as a three-dimensional object, with perspective<ref>[http://www.porterfieldsfineart.com/josephholodook/images/leprechaun72.jpg]</ref>, real rainbows never have this appearance. + + +
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Complete circular rainbows can be seen under the right conditions; in particular, when viewing the mists over Niagara Falls early or late in the day. CIrcular rainbows can sometimes be seen from an airplane when it flies over clouds, the rainbow actually encircling the airplane's shadow on the clouds. One way to think about the rainbow is that the mist or rain is like a projection screen, and the rainbow can only be seen where the projection screen is. When the projection screen is large enough, you see the entire circular rainbow.
Complete circular rainbows can be seen under the right conditions; in particular, when viewing the mists over Niagara Falls early or late in the day. CIrcular rainbows can sometimes be seen from an airplane when it flies over clouds, the rainbow actually encircling the airplane's shadow on the clouds. One way to think about the rainbow is that the mist or rain is like a projection screen, and the rainbow can only be seen where the projection screen is. When the projection screen is large enough, you see the entire circular rainbow.
The rainbow is often depicted inaccurately in pictures. For example, it may be a three-dimensional object, with perspective<ref>[http://www.porterfieldsfineart.com/josephholodook/images/leprechaun72.jpg]</ref>, real rainbows never have this appearance. This picture also shows the rainbow as if it had separated, sharp-edged bands of color, in the order yellow, orange, red, green, blue. Real rainbows show an extremely subtle blending of color. It is hard to pick out separate colors in a rainbow, but of course to the extent that one can, they appear in the "Roy G. Biv" order, red outermost, then orange, yellow, green, and a range bluish shades which, in a real rainbow, are hard to distinguish and name.
It is extremely difficult to produce ''any'' kind of accurate picture of a rainbows; even color photographs do a poor job, because a rainbow contains colors that are not within the gamut that can be produced by mixing three primaries.
==References==
==References==
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