The Rainbow Formed

How is the rainbow formed?
            We observed the sky on a rainy day, and seen the arc of multi-colored lights that appears when the sun shines through the rain.

            Though it appears to be white, light actually comprises seven different colors. They are--- Violet, Indigo, Blue, Green, Yellow, Orange and Red, abbreviated as VIBGYOR. Each letter of this word represents a colors is known as dispersion, while the strip of seven different colors is called the spectrum.
White light on refraction, splits into seven colors
            A rainbow is normally seen after rain, when the atmosphere is full of small droplets of water. These spherical raindrops act like tiny prisms. When the rays of the sun fail on these droplets, the rays get refracted as they pass through the raindrops, and split up into the VIBGYOR colors. Each component of the ray of light gets refracted at a different of the ray of light gets refracted at a different angle, thus separating into seven different colors. Thus, white light is actually made of seven colors.

            The rainbow is a semi-circular arc because the sun is circulating. A complete rainbow has a primary and secondary arc. The primary arc is more brilliant and its colors are violet on the inner side, then indigo, blue, green, yellow, orange and red on the outside. The colors are reversed in the secondary arc; red is on the inner side and violet on the outer side. The secondary are is located above the primary arc. This rainbow is formed by sun’s rays, which have been reflected and refracted again after the first reflection and refraction within the raindrops.

            The rainbow is seen in that portion of the sky that is opposite to the sun. It is essential for the formation of the rainbow that the sun shines just after the rain. It is also necessary that the sun, our eyes and the centre of the rainbow lie on the same plane. Rainbows are generally seen in the early morning or late evening, after the showers.

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