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recombination of the spectrum of white light???

Recombination of seven colours to form white light:   As shown in figure take two identical prisms P1  and P2.  Keep the second prism P2 upside down with respect to the first prism.  Allow a narrow beam of whit light to fall on first prism P1.



The first prism P1 disperses the white light into seven colours.   The second prism  P2 receives these seven colours and recombines them into white light.  Thus a beam of white  light emerges from the other side of the second prism.  This observation gave Newton the idea that the sunlight is made of seven colours.
Any light that gives a spectrum similar to that of sunlight is called white light.



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