A rainbow happens when the rain drops and the sunbeams are crossed. The light of the sun is made up of all the colors, those which blended they produce illumination. When the light of the sun penetrates the drops of water, it is reflected in the interior surfaces. While it passes through the drops, the light separates in its colors that they compose it, what produces a very similar effect to that of a prism. And for an instant, each rain drop flashes its colors to the observer, before another rain drop takes its place.
Usually, a rainbow one can observe in the opposed address of the sun. The light of the rainbow is reflected to the eye, to an angle of 42 grades in connection with the sunbeam. The arch form, is part of the cone of light that is cut by the horizon. If you travel toward the end of a rainbow, this will move ahead of you, maintaining their form.
The brilliant primary rainbow has the red color in the external and blue border inside itself. In the superior part of the atmosphere, there is always another less brilliant rainbow, with the colors in inverse order. This secondary rainbow, is the result of additional reflection, of the sunbeams through the rain drops. It is more visible when there are dark clouds behind of this.
I adjusted the size to 800 x 600, shine, contrast and sharp.
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* Anno Nuovo e felice