How a rainbow appears in the sky after the rain | Why a rainbow appears

In distant times, due to lack of knowledge, people explained the miracles and beauty of nature with the help of myths and fairy tales. Then people did not have the opportunity to study the scientific justification of why it rained, hail or thunder thundered. Similarly, people described everything unknown and distant, the emergence of a rainbow in the sky is no exception. In ancient India, the rainbow was the bow of the Indra-Gromovets, in ancient Greece, there was a virgin goddess Irid with rainbow robes. To correctly answer the child, as a rainbow arises, first you should understand this issue yourself.

Scientific explanation of the rainbow

Most often, the phenomenon occurs during a small rain or immediately after its end. After it, the smallest clots of the fog remain in the sky. It is when the clouds dissipate and the sun comes out, everyone can watch a rainbow with their own eyes. If it occurs during the rain, then the color arc consists of the smallest drops of water of different sizes. Under the influence of refraction of light, many small water particles form this phenomenon. If you observe a rainbow from a bird’s eye view, then it will not be a colored arc, but a whole circle.

In physics, there is such a thing as a “dispersion of light”, Newton also gave his name. The dispersion of light is a phenomenon during which the decomposition of light into the spectrum occurs. Thanks to him, the usual white stream of light decomposes into several colors perceived by the human eye:

  • red;
  • Orange;
  • yellow;
  • green;
  • blue;
  • blue;
  • violet.
  • In the understanding of human vision, the colors of the rainbow are always seven and each of them is located in a certain sequence. However, the colors of the rainbow go continuously, they smoothly connect among themselves, which means that it has much more shades than we can see.

    Conditions for the occurrence of a rainbow

    To see the rainbow on the street, two main conditions must be met:

  • The rainbow appears more often if the sun is low above the horizon (sunset or sunrise);
  • you need to stand with your back to the sun and facing the passing rain.
  • A multicolored arc appears not only after or during the rain, as well as:

  • Wrapping a garden with a hose;
  • while bathing in water;
  • in the mountains near the waterfall;
  • In the city fountain in the park.
  • If the rays of light are reflected from a drop at the same time several times, a person manages to see a double rainbow. It is noticeable much less often than usual, the second rainbow is much worse than the first and its color goes in mirror reflection, t.e. It ends with purple.

    How to make a rainbow yourself

    To make a rainbow himself need a rainbow:

  • water bowl;
  • white sheet of cardboard;
  • A small mirror.
  • The experiment is carried out in sunny weather. To do this, a mirror is lowered into a regular bowl of water. The bowl is located so that sunlight falling on the mirror is reflected on a sheet of cardboard. To do this, some time will have to change the angle of inclination of objects. Having caught a slope, you can enjoy the rainbow.

    The fastest way to independently make a rainbow is to use the old CD-disk. Change the angle of inclination of the disk under direct sunlight and get a clear bright rainbow.

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