Question

Why does a rainbow contain a pure spread of spectral colors?​

Answer 1

A rainbow does not contain a pure spread of spectral colors, although it is somewhat close. A spectral color is a color that contains only one wavelength component of its electromagnetic wave.

Answer 2

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$\sf 1)this \: is \: because \: the \: front \: \\ \sf part \: of \: the \: rain \: drop \: is \: round.$

$\sf2)a \: rainbow \: is \: not \: a \: pure \: spectrum.$

$\sf \: 3)each \: part \: contains \: a \: mixture \: of \: spectral \: colors.$