The reason for the appearance of the rainbow

The reason for the appearance of the rainbow


  • 1 Rainbow 1.1 lunar rainbow 1.2 interpretation of the phenomenon of the rainbow 1.3 angle rainbow 1.4 arc secondary
  • 1.1 lunar rainbow
  • 1.2 interpretation of the phenomenon of the rainbow
  • 1.3 angle rainbow
  • 1.4 arc secondary


Also known as the colors arc and arc rain, which is a natural physical phenomena that occur due to the passage of light rays in the rain drops and Anksarha and decay inside, the appearance of the rainbow is limited to rainy days or days after the rain fall on condition that the sun is bright.

Rainbow lunar

Rainbow appears visible in the form of a half circle and in some cases appears lunar, where broken light rays reflected from the moon inside the water droplets according to the location of the moon in that period, the rainbow lunar eye white shows due to the inability of the eye to see colors and distinguish them through night, but in the daylight hours shows the rainbow gradual from red to orange, followed by down yellow to violet color.

Interpretation of the phenomenon of the rainbow

It begins to form a rainbow when the refraction of light rays falling from the sun at an angle tilted inside the rain drops, then light rays are reflected once again when it passes the internal surface of the rain drops, as broken for the third time when they leave the rain drops, the overall effect of the light falling thanks to a reversal shows over a large of angles with the increasing concentration of reversal happening at the angle of 40 degrees, 42 degrees angle.

The rainbow appears above water bodies radius is much less than that appears over the land under the same conditions, is due to the high salinity of the sea water and possession of a high refractive index more than the refractive index your rain water.

Rainbow angle

If the vision of the eye of the rainbow, this means that it is located in the direction opposite to the direction of solar radiation, in addition to the occurrence of cone angle between the line of sight and points on the rainbow, and reach this angle 42 degrees known as the angle of the rainbow, and the viewing angle amounts to 84 degrees.

Secondary bow

Be under the arc main rainbow rainbow another opposite his arc in color order, and is due to the occurrence of another reflection of light rays penetrating the rain drops and exit from a different angle from the first corner, and a second rainbow outside of the arc main rainbow nine angle degrees, as a vacuum interval between the arc and the second main rainbow color is darker than the color of the rest of the parts of the sky, known as the gap naming Alexander gap, as the second rainbow appears very light-colored, and the order of colors, unlike the order of the rainbow colors of the main.


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