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Today's episode is from a Wikipedia. host Benjamin Foster.

Today's episode is from a Wikipedia article titled Rainbow.

A Rainbow is an optical phenomenon caused by refraction, internal reflection, and dispersion of light in water droplets, resulting in a continuous spectrum of

light appearing in the sky.

The rainbow takes the form of a multi-colored circular arc.

Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

Rainbows can be caused by many forms of airborne water.

These include not only rain but also mist, spray, and airborne dew.

Rainbows can be full circles, however the observer normally sees only an arc formed by illuminated droplets above the ground, and centered 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 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 colors reversed was red on the inner side of the arc. This is caused by the light

being reflected twice on the inside of the droplet before leaving it.

Rainbows can be observed whenever there are water droplets in the air and sunlight shining from behind the observer at a low altitude angle.

Because of this rainbows are usually seen in the western sky during the morning and in the eastern sky during the early evening. The most spectacular rainbow displays happen when half the sky is still dark with

raining clouds and the observer is at a spot with clear sky in the direction of the sun. 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 degrees outside of the primary rainbow with inverse order of colors.

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