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It is a rule that violet light bend that most and red color bend least way. Most of the light passes through the rain drop. Because of bending of colors in different ways and on different angle each color that emerges from raindrop produce a spectrum of colors. As only single color from each drop reaches to observer, so there are number of raindrops from which each rain drop reflect the light back to an observer at slightly different angle, as to produce different primary colors of rainbow. Secondary rainbow appears above the primary rainbow. When two colors reflection occur inside a raindrop at such angle that it results into secondary rainbow. When weaker light that start emerging to produce a dimmer rainbow effect. Refraction happens as light enters and leaves a prism. Red light is refracted the least and violet light is refracted the most. This causes the different colours in the light to spread out to form a spectrum. Separating the colours like this is called dispersion. We say that the light has been dispersed.

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14y ago

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