Question

why rainbow is the natural spectrum?​

Answer 1

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. ... Rainbows caused by sunlight always appear in the section of sky directly opposite the sun. Rainbows can be full circles.

Answer 2

a rainbow is caused by reflection, refraction and dispersion of light in water droplets resulting in spectrum of light in the sky