Violet colour is seen at the bottom of the spectrum, when white light is dispersed by a prism. Explain.

Violet colour is seen at te bottom of the spectrum,when white light is dispersed by a prism.Why?

(a) The blusih colour predominates in clear sky . (b) Voilet colour is seen at the bottom of the spectrum when white light is dispersed by a prism. State resons to explain these observations.

What is a spectrum ? Why do we get a spectrum of seven when while light is dispersed by a prism ? OR Explain how a spectrum is formed.

In the spectrum of visible light produced by a prism dispersion is

Answer the following questions What is a spectrum ? why do we get a spectrum of seven colours when while light is dispersed by a prism ?