A rainbow doesn't have a rear. If you somehow managed to walk totally to the opposite side of the fog cloud that is making the rainbow and pivot, you would not see a rainbow. You need to understand that a rainbow is certifiably not a fixed actual item. All things considered, it is an example of light that turns into a steady picture just when you take a gander at it from the correct point. You might not have seen it, yet every time you gaze straight toward the focal point of a rainbow, the sun is straightforwardly behind your head. This is the lone point at which the light example that establishes the rainbow can enter your eye and consequently lead you to see it.
The sun is consistently in the contrary piece of the sky from the focal point of the rainbow. This is on the grounds that a rainbow is in reality daylight which has been refracted and reflected. Refraction happens when the daylight enters and leaves the little round water drops that comprise the fog. This refraction is the thing that causes the rainbow's spread of tones and curving shape. In any case, the general area of the rainbow is resolved for the most part by the progression in the process where the daylight is reflected off of the internal back surface of the water drops. The daylight that reflects just a single time off the internal posterior of the fog beads is the thing that comprises the essential rainbow. Moreover, a limited quantity of the daylight reflects twice off the internal back surface.
This light therefore emerges from the fog bead at a marginally extraordinary point, prompting the optional bow. The optional bow is consistently there, yet it is faint to such an extent that people can just see it during clear review conditions. This subsequent reflection just alters the light's course a limited quantity. Accordingly, both the essential bow and the auxiliary bow must be seen when turning away from the sun. Besides, neither one of the ones can be seen from the rear, for example when looking toward the sun.
This brings other interesting questions. Can some sunlight pass through the back of the water drop without being reflected? Can't you see this light from behind the rainbow? The answer is yes. Although there is only a small amount, some of the sunlight that enters the fog drop will continue to pass through the back instead of being reflected.
Therefore, if you go to the other side of the misty cloud that is forming a rainbow and turn around, you will indeed see the pattern of light (if the viewing conditions are right). However, this will not be a rainbow. As shown below, this will be a pattern called the "atmospheric corona". The solar corona still has an arc shape and multiple colors, but the size and color sequence of the solar corona are different from the rainbow. Since most of the sunlight entering the fog drops is reflected but not transmitted, rainbows are very bright and common, while the corona is dark and rare. Also, because you are behind the rainbow, you are now looking straight at the sun. Therefore, the glare of the sun makes it difficult to see the corona.
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