Question

Write different between pure and impure spectrum I

Answer 1

A pure spectrum is one in which all seven colours of white light are separated with distinct boundaries and all colours are bright. No colour overlap each other.

An impure spectrum is one in which all seven colours of white light are separated with indistinct boundaries .....one colour overlaps the other.....

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Answer 2

Pure spectrum - colors do not overlap, unlike those of an impure spectrum 
Pure spectrum - needs two triangular prisms to produce, instead of one. 
Pure spectrum is produced by a point source of light, using one prism. An impure spectrum comes from an extended source of light.