A rainbow is regarded as one of the most spectacular light shows observed on the earth. A rainbow is a multi coloured arc formed by light striking water droplets. Rainbows are created after rain by the reflection, refraction, and dispersion of light in water droplets. All of these events produce a light spectrum in the sky, which is known as a rainbow.
Primary rainbow
One total internal reflection and two refractions of white light by water droplets produce the primary rainbow.
Secondary rainbow
Two total internal reflections and two refractions of white light by water droplets produce a secondary rainbow. The colour of a secondary rainbow is brighter than that of a primary rainbow.
