Rainbow

a rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the sun shines onto droplets of moisture in the Earth's atmosphere.They take the form of a multicoloured arc,with red on the outer part of the arch and violet on the inner section of the arch. More rarely,a secondary rainbow is seen,which is a second lighter arch outside the original arch with colours in the opposite order,that is violet on the outside and red on the inside.