Prism 'n' Fourier bhai transform

*What a Prism does?
Essentially its Fourier transform!
a prism splits white light into a spectrum of colors.
http://www.intmath.com/fourier-series/7-fast-fourier-transform-fft.php

*another natur(e)al ex:
Formation of rainbow

So..

Observe Nature
Derive math..:)

sai bhai.