How the rainbow form

1.	How the rainbow form
Answer» \tA rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.\tIt is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.\tAlways it formed in the direction opposite to the sun.\tTo see a rainbow, the sun must behind us and the water droplets falls infront of us.\tWhen a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.\tWhen different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).\tThe water drops again refracts the different colours, when it comes out from the raindrop.\tAfter leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow. A rainbow is formed by the dispersion of sunlight by tiny water droplets present in the atmosphere. The water droplets act like small prisms. Th ey refract and disperse the light ray coming from the sun, and reflect internally and finally refract it again when it comes out of the rain drop. That\'s how a rainbow consisting of seven colours is formed.

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