Recombination of the Spectrum of White light | Critical Angle

What is a spectrum of light ?

"…........................." light is deviated the least in the spectrum of white light obtained with a glass prism.

In the formation of spectrum of white light by a prism : (i) which colour is deviated least ? (ii) which colour is deviated most ?

"…....................." light is deviated the maximum in the spectrum of white light obtained with a glass prism.

Dispersion Of Light Through Glass Prism|Spectrum Of White light|Dispersion Of Light |Cause Of Dispersion Of Light|Re-Combination Of Spectrum Colours To Give White Light|Questions|Home Work|Summary

(a) What is spectrum ? What is the name of glass shape used to produce a spectrum ? (b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order, starting with red.