Rainbow Sunset Oregon

by Michele Avanti

Title

Rainbow Sunset Oregon

Artist

Michele Avanti

Medium

Photograph - Photography & Digital Art

Description

Rainbow Sunset Oregon by photograph and digital artist, Michele Avanti
This photo was taken February 2014 in Myrtle Creek, Oregon

Nothing more beautiful or more dramatic than a sunset, except when you add a rainbow! Oregon is a state of frequent rain and we get some spectacular rainbows. Here is one to enjoy.

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A rainbow is an optical and meteorological phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
Rainbows can be full circles, however, the average observer sees only an arc, formed by illuminated droplets above the ground,[1] and centred on a line from the sun to the observer's eye.
In a "primary rainbow", the arc shows red on the outer part and violet on the inner side. This rainbow is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, red facing toward the other one, in both rainbows. This second rainbow is caused by light reflecting twice inside water droplets.

The rainbow is not located at a specific distance, but comes from an optical illusion caused by any water droplets viewed from a certain angle relative to a light source. Thus, a rainbow is not an object and cannot be physically approached. Indeed, it is impossible for an observer to see a rainbow from water droplets at any angle other than the customary one of 42 degrees from the direction opposite the light source. Even if an observer sees another observer who seems "under" or "at the end of" a rainbow, the second observer will see a different rainbow�farther off�at the same angle as seen by the first observer.

A rainbow spans a continuous spectrum of colours. Any distinct bands perceived are an artefact of human colour vision, and no banding of any type is seen in a black-and-white photo of a rainbow, only a smooth gradation of intensity to a maximum, then fading towards the other side. For colours seen by the human eye, the most commonly cited and remembered sequence is Newton's sevenfold red, orange, yellow, green, blue, indigo and violet.[2][3]
Rainbows can be caused by many forms of airborne water. These include not only rain, but also mist, spray, and airborne dew.

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September 23rd, 2014

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