Light of primary rainbow arc is 96 % polarised tangential to the arch.
2.
It appears about 10?outside of the primary rainbow, with inverse order of colours.
3.
The sky inside a primary rainbow is brighter than the sky outside of the bow.
4.
In a primary rainbow, the arc shows red on the outer part and violet on the inner side.
5.
However, light that reflects once off the backs of raindrops becomes eligible to be part of a primary rainbow.
6.
Due to this angle, blue is seen on the inside of the arc of the primary rainbow, and red on the outside.
7.
In the late 13th century and early 14th century, Kaml al-D + n al-Fris + and Theodoric of Freiberg were the first to give the correct explanations for the primary rainbow phenomenon.
8.
Within the " primary rainbow " ( the lowest, and also normally the brightest rainbow ) the arc of a rainbow shows red on the outer ( or upper ) part of the arc, and violet on the inner section.
9.
The reason for this dark band is that, while light " below " the primary rainbow comes from droplet reflection, and light " above " the upper ( secondary ) rainbow also comes from droplet reflection, there is no mechanism for the region " between " a double rainbow to show any light reflected from water drops, at all.
10.
He explained the primary rainbow, noting that " when sunlight falls on individual drops of moisture, the rays undergo two refractions ( upon ingress and egress ) and one reflection ( at the back of the drop ) before transmission into the eye of the observer . " He explained the secondary rainbow through a similar analysis involving two refractions and two reflections.
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